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高分子科学：英文版

高分子科学：英文版

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《高分子科学(英文版)》Chinese Journal of Polyer Science 是创刊于1983年的刊物。
  • 发文量：3147
  • 被引量：1157
  • H指数：8
  • 开始收录时间：1989(1)
  • CNKI综合因子：0.772
  • 维普期刊影响因子： 0.67
  • 万方期刊影响因子：0.67
  • 创刊时间：1983
  • 国内刊号/CN：11-2015/O6
    国际刊号/ISSN：0256-7679
  • 发行周期：月刊
    邮发代号：-
  • 主管单位：
    主办单位：中国化学会;中国科学院化学研究所
高分子科学：英文版-联系信息
  • 主编：Qi-Feng Zhou
  • 电话：010-82625102
  • 邮箱：cjps@iccas.ac.cn
  • 地址：Zhongguancun North First Street 2,Beijing
  • 邮编：100190
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高分子科学：英文版 >2023年第12期

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  • 摘要：Submission Papers appearing in the Journal comprise Rapid Communications,Feature Articles,Reviews,Articles,which should contain original information,theoretical or experimental,on any topics in the field of polymer science and polymer material science.Papers already published or scheduled to be published elsewhere should not be submitted and certainly will not be accepted.
  • 摘要：Photothermo-chemotherapy, as a new strategy for cancer treatment, incorporates the complementary advantages of photothermal therapy and chemotherapy. In this study, a p H-sensitive diblock copolymer poly(aspartic acid-butanediamine)-poly(2-(diisopropylamino)ethyl methacrylate)(PAsp(DAB)-PDPA) was synthesized and self-assembled into doxorubicin-loaded micelle, which was further used as a template to form a gold nanoshell. After further modification with poly(ethylene glycol), the resulting nanoplatform provided good biocompatibility and desirable photo-thermal conversion efficiency to facilitate photothermal therapy. Meanwhile the nanoparticle also exhibited p H sensitivity, which prevented drug loss while circulating in the blood but enabled rapid drug release after endocytosis. An improved effect was achieved with the combination of photothermal therapy and chemotherapy. In addition, systemic delivery of the nanoplatform could be monitored by photoacoustic tomography. Thereby, this multifunctional nanoplatform would be highly potential for the diagnosis and therapy of cancer.
  • 摘要：Bacterial infections and the associated morbidity and mortality due to bacterial pathogens in wounds and medical implants have been increasing as most of current coatings cannot fulfill all the requirements including excellent intrinsically antibacterial activity,low cytotoxicity, and favorable physical properties. Herein, we present a kind of antibacterial hydrogel based on ε-poly(L-lysine)(EPL)grafted carboxymethyl chitosan(CMC-g-EPL) as the inherently antibacterial matrix and the surplus EPL as highly efficient antimicrobial agent. Such hydrogels possess tunable swelling abilities with water absorption percentages of 800%–2000% and modulus varying from10 kPa to 100 kPa, and exhibit two-stage excellent antibacterial behavior. First, the free EPL can be released from the hydrogel network for quick and highly efficient bacteria killing with 99.99% of efficacy; second, the grafted EPL endows hydrogel matrix with prolonged intrinsically antibacterial activity, especially when most of free EPL is released from the hydrogel. Overall, we provide a new insight for preparing highly effective antibacterial hydrogels.
  • 摘要：指向nano探查基于的一个可被细菌破坏的肿瘤 poly (? -caprolactone)-b-poly(ethylene 乙二醇)有磁性的回声成像( MRI )的块共聚物( PCL-b-PEG ) micelle functionalized 对比代理人 diethylenetriaminepentaacetic 酸金轧(DTPA-Gd3+)在壳上并且一在红外线附近( NIR )在为磁性的回声和光双形式的成像的核心的染料是准备。纵的 relaxivity (r 1 )PCL-b-PEGDTPA-Gd3+ ， micelle 是 13.4 (mmol/L )? 1s ? 1， DTPA-Gd3+ 的三褶层，并且比有类似的结构的许多聚合对比代理人的高。在里面忍受 xenografted 胸肿瘤的一只裸体老鼠的光成像显示出的 vivo 双形式的 micelle 优先地经由 folic 在肿瘤积累了由提高的渗透和保留(EPR ) 效果的调停酸的活跃指向和被动累积。结果显示 dualmodality micelle 是为癌症察觉和诊断的有希望的 nano 探查。
  • 摘要：Polyimides(PIs) with various molecular weights synthesized via the reaction of aromatic diamine monomer containing tert-butyl groups with aromatic dianhydride were highly soluble in common organic solvents and some epoxy resins at room temperature. These PIs can be incorporated in the absence of organic solvent into epoxy resin E51 with the loading below 2 wt% forming EP-PI composites. No phase separation is observed by SEM on cryogenically fractured surfaces of EP-PI composites. The PI can improve mechanical properties, especially impact strength. Adding 2 wt% PI-1.5W, the impact strength reaches to 55 k J/m2 with the increase in tensile and flexural strengths by 14% and 3%, respectively. SEM analyses for the fracture surface suggest that PI reduces the crosslink density, improves the plasticity of epoxy resin and changes the mode of fracture from fragile to ductile. Moreover, the glass transition temperature of EP-PI composites was found to increase to a significant extent.
  • 摘要：Response speed is one of the most important evaluation criteria for CO_2 sensors. In this work, we report an ultrafast CO_2 fluorescent sensor based on poly[oligo(ethylene glycol) methyl ether methacrylate]-b-poly[N,N-diethylaminoethyl methacrylate-r-4-(2-methylacryloyloxyethylamino)-7-nitro-2,1,3-benzoxadiazole] [POEGMA-b-P(DEAEMA-r-NBDMA)], in which DEAEMA units act as the CO_2-responsive segment and 4-nitrobenzo-2-oxa-1,3-diazole(NBD) is the chromophore. The micelles composed of this copolymer could disassemble in 2 s upon CO_2 bubbling, accompanying with enhanced fluorescence emission with bathochromic shift. Furthermore,the quantum yield of the NBD chromophore increases with both the CO_2 aeration time and the NBD content. Thus we attribute the fluorescent enhancement to the inhibition of the photo-induced electron transfer between unprotonated tertiary amine groups and NBD fluorophores. The sensor is durable although it is based on "soft" materials. These micellar sensors could be facilely recycled by alternative CO_2/Ar purging for at least 5 times, indicating good reversibility.
  • 摘要：The effects of magnesium oxide(Mg O) on the flame retardant performance of intumescent systems based on ammonium polyphosphate(APP) and pentaerythritol(PER) in ethylene vinyl acetate copolymer(EVA) were studied. The results showed that Mg O affects both the quality and quantity of residual char. There is an optimal value for the loading amount of Mg O. More or less Mg O loading may cause the formation of defective char layers and worsen the flame retardancy of EVA. According to the results of limiting oxygen index(LOI), vertical flammability test(UL94 rating) and cone calorimetry(CONE), the best flame retardancy with a strong and well intumescent char is obtained from the sample with 1 wt% of Mg O, which has the highest LOI value of 27.9, UL94 rating of V-0 and the lowest peak heat release rate of 242 k W·m?2.
  • 摘要：一个通用方法被描述由介绍反应的功能的组到聚合底层并且 covalently 的表面上改变表面 biocompatibility 有约束力他们与 biomolecules。有保护的羧基的酸功能的块共聚物， poly (styrene-b-tert-butyl acrylate )(PS-PtBA ) ，是从在 bioinert 聚苯乙烯(PS ) 上的甲苯的答案涂的纺纱形成 bilayer 结构的底层：表面层(tert 丁基 acrylate )(PtBA ) poly 在空气聚合物接口和与 PS 底层纠缠的 PS 块的底部层堵住那份订单。PtBA 层和 PtBA 的 tert 丁基酉旨组的区域密度的厚度与旋转涂层答案的集中线性地增加了直到 2 nm PtBA 的浸透的单层范围在 0.4% W/W 的集中被完成。保护的羧基的酸组被经由酰胺契约与 FMRF 肽为 bioconjugation 暴露 PtBA 的 tert 丁基酉旨组到 trifluoroacetic 酸(TFA ) 产生。为浸透的表面的 bioconjugation 反应的收益被计算基于 X 光检查光电子是 37.1% 光谱学(XPS ) 大小。每 functionalization 步的成功被 XPS 和接触角度大小表明并且描绘。这个聚合物 functionalization/modification 概念能被选择适当的功能的块共聚物和 biomolecules 达到新奇 biocompatibility 几乎用于任何聚合底层。关键词表面 functionalization - Biocompatibility - Bioconjugation
  • 摘要：外部地应用的机械事先思想准备的效果，即预先影响治疗，在骨折上，抵抗为聚丙烯(PP ) 被调查。影响力量经由 notched 或 unnotched 样品被获得。预先影响处理对破裂抵抗的改进有利，这被显示出。影响力量线性地增加与适用预先影响精力。光并且 SEM 结果证明为破裂抵抗的改进有至少二可能的机制。一个人是弄钝被介绍的效果的裂缝，减少到应用槽口的 PP 的敏感 notched 样品由预先影响处理。其它是导致由的大量 microvoids 的形成预先影响治疗，改变压力分发并且在第二影响大小导致 PP 的集中的塑料变丑，导致骨折抵抗的改进。
  • 摘要：Chinese Journal of Polymer Science(CJPS)is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry,Chinese Academy of Sciences.CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by International Advisory Board in which many famous active polymer scientists all over the world are included.
  • 摘要：The thermal quenching behaviors of the temperature sensitivity paints(TSP) composed of europium(Ⅲ) thenoyltrifluoroacetonate(Eu TTA) and Eu-phenanthrene complex(Eu-2) in polystyrene(PS), polymethylmethacrylate(PMMA) and epoxy resin(EP) were investigated. It is found that both the emission intensity and temperature sensitivity were not only affected by the luminescence probes, but also by the polymer matrix. The interaction between probes and matrix results in the alteration of both the non-radiation decay rate and the activation energy of the non-radiative process for the thermal quenching process, i.e. larger activation energy of the non-radiative process shows higher temperature sensitivity and less emission intensity. Therefore, it was confirmed that the temperature sensitivity and luminescent intensity of TSP depended not only on the luminescence probes but also on the polymer matrix.
  • 摘要：Sound absorption properties of natural kapok fibers have been investigated. Kapok fibrous assemblies with different bulk density, thickness, fiber length and orientation were manufactured, and their acoustical performances were evaluated by using an impedance tube instrument. Results show that the kapok fiber has excellent acoustical damping performance due to its natural hollow structure, and the sound absorption coefficients of kapok fibrous assemblies are significantly affected by the bulk density, thickness and arrangement of kapok fibers but less dependent on the fiber length. Compared with assemblies of commercial glass wool and degreasing cotton fibers, the kapok fiber assemblies with the same thickness but much smaller bulk density may have the similar sound absorption coefficients. Theoretical modelling of the acoustical damping performance of kapok fibers shows a good agreement with the experimental data. All the results demonstrate that kapok fiber is a promising light and environment-friendly sound absorption material.
  • 摘要：The time-resolved attenuated total reflectance-Fourier transform infrared(ATR-FTIR)spectroscopy is employed to investigate the transport mechanism of gel electrolytes by monitoring the diffusion behavior of propylene carbonate-lithium bis(trifluoromethylsulfonyl)imide(PC-LiTFSI)solution through poly(vinylidene fluoride-co-hexafluoropropylene)(P(VDF-HFP))films.Fickian behavior has been observed for both TFSr and PC.Higher temperature leads to faster diffusion of TFSI'and PC,which could be related to the increased free volume in P(VDF-HFP)matrix and rapid molecular movements upon heating.Various molecular interactions among LiTFSI,PC and P(VDF-HFP)have been recognized.During the diffusion process,PC molecules,in the form of small clusters,can firstly diffuse through the P(VDF-HFP)film and interact with P(VDF-HFP)by dipole-dipole interaction,acting as the plasticizer.Then,Li+diffuses into P(VDF-HFP)with the help of ion-dipole interactions between Li+and C=0 of PC.Meanwhile,TFSI-diffuses through the polymer matrix in solvation states.In addition,slight ion-dipole interactions between Li+and P(VDF-HFP)have been observed as well.Results in this work contribute to a better understanding of transport process in gel polymer electrolytes for lithium-ion batteries and support the development of improved gel polymer electrolytes by rationally regulating molecular interactions.
  • 摘要：Photo-responsive mechanical actuator is a class of stimuli-responsive materials transferring light to mechanical energy through macroscopic transformation.To fabricate photo-responsive mechanical actuator,soft polymeric materials crosslinked with functional bridging structures are desired.Supramolecular interaction is a relatively common way to fabricate crosslinked materials due to its excellent self-assembly performance.And azobenzene and derivatives are ideal candidates of photo-responsive materials because of the unique photo-induced trans-cis isomerization.Here,a new kind of crosslinked materials based on supramolecular interaction between 4,4'-dihydroxyazobenzene and chitosan is reported.Under 355 nm irradiation,the macroscopic bending of polymeric materials occurs rapidly due to the photo-isomerization of 4,4-dihydroxyazobenzene.Meanwhile,the photo-responsive mechanical actuator can also lift weight which is up to 200 times that of the actuator itself,and convert energy from light to mechanical work efficiently.This report suggests a new kind of photo-responsive actuator based on supramolecular interaction and may be helpful to contribute a theoretical basis to the design and synthesis of photo-responsive mechanical actuator suitable for large-scale manufacturing industrialization in future.
  • 摘要：Submission Papers appearing in the Journal comprise Rapid Communications,Feature Articles,Reviews,Articles,which should contain original information,theoretical or experimental,on any topics in the field of polymer science and polymer material science.Papers already published or scheduled to be published elsewhere should not be submitted and certainly will not be accepted.Rapid Communications deal with significant findings worthy of urgent publication.For papers submitted for publication as Rapid Communications,a brief introduction outlining the significance of the work and the rationale for urgent publication must be submitted together with the manuscript.
  • 摘要：Poly(propylene carbonate phthalate)(PPC-P)is a chemically modified poly(propylene carbonate)(PPC)biodegradable thermoplastic by introducing phthalic anhydride(PA)as the third monomer into the copolymerization of propylene oxide(PO)and CO_(2).To enhance the thermal and mechanical properties of PPC-P,a branching agent pyromellitic anhydride(PMDA)was introduced into the terpolymerization of PO,PA and CO_(2).The resulting copolymers with branched structure,named branched PPC-P,can be obtained using metal-free Lewis pair consisting of triethyl borane(TEB)and bis(triphenylphosphine)iminium chloride(PPNCl)as catalyst.The products obtained were analyzed by NMR spectroscopy and their thermal,mechanical properties and melt processability were evaluated by DSC,TGA,tensile test and melt flow index(MFI)measurement.The obtained branched PPC-P has a high molecular weight up to 156.0 kg·mol^(-1).It shows an increased glass transition temperature(Tg)higher than 50℃and an enhanced tensile strength as high as 38.9 MPa.Noteworthily,the MFI value decreases obviously,indicative of an improved melt strength arising from the branched structure and high molecular weight.What is more,the branched PPC-P exhibits reasonable biodegradability,which demonstrates the great potential as a new green thermoplastic for the family of biodegradable plastics.
  • 摘要：The dopamine containing hydrogels with rapid responsive shape memory capability were synthesized by a one-pot method. The temporary shape of hydrogel was fixed within 20 s in Na OH solution by the tris-complex crosslinking of metalligand complex between Fe3+ ions and catechol groups, while the permanent shape was recovered completely in HCl solution within 60 s upon the change from tris-complex to mono-complex. The hydrogel showed unique spontaneous actuation behavior. It could curl spontaneously without further external force deformation when immersed in Na OH solution again after the first shape recovery in HCl solution. This might be attributed to the competitive result of swelling and additional tris-complex crosslinking formation when immersed in Na OH solution. In addition, the hydrogels also had proper modulus, elongation ratio and tensile strength. Such hydrogel provides a new candidate material for designing soft actuators and robots modulated with spontaneous actuating.
  • 摘要：Microgels with a thermo-sensitive poly(N-isopropylacrylamide)(polyNIPAm) backbone and bis-imidazolium(VIM) ionic cross-links, denoted as poly(NIPAm-co-VIM), were successfully prepared. The as-synthesized ionic microgels were converted to nanoreactors, denoted as Au@PNI MGs, upon generation and immobilization of gold nanoparticles(Au NPs) of 5–8 nm in size into poly(NIPAm-co-VIM). The content of Au NPs in microgels could be regulated by controlling the 1,6-dibromohexane/vinylimidazole molar ratio in the quaternization reaction. The microgel-based nanoreactors were morphologically spherical and uniform in size, and presented reversible thermo-sensitive behavior with volume phase transition temperatures(VPTTs) at 39–40 °C. The Au@PNI MGs were used for the reduction of 4-nitrophenol, of which the catalytic activity could be modulated by temperature.
  • 摘要：Near-infrared(NIR) nanoparticles(NPs) based on fluorescence resonance energy transfer(FRET) were prepared by coencapsulation of a red aggregation-induced emission(AIE) molecule, 2-(4-bromophenyl)-3-(4-(4-(diphenylamino)styryl)phenyl)fumaronitrile(TB), and a commercial NIR fluorescence dye, silicon 2,3-naphthalocyanine bis(trihexylsilyloxide)(NIR775) with an amphiphilic polymer poly(styrene-co-maleic anhydride)(PSMA). The surface of the NPs, PSMA@TB/NIR775, was modified with poly(ethylene glycol)(PEG) to increase the in vivo biocompatibility of the NPs. The PSMA@TB/NIR775 NPs showed a strong NIR(780 nm) narrow emission and excellent two-photon absorption property. Moreover, the NPs exhibited good monodispersity, stability, and low cytotoxicity.Under the excitation of a 1040 nm femtosecond(fs) laser, the emission peaks at 680 nm of TB and 780 nm of NIR775 excited by FRET were obtained. We utilized PSMA@TB/NIR775 NPs as fluorescent contrast agents for two-photon excited NIR microscopic imaging, and good NIR imaging effect of mouse brain vasculature was obtained with the imaging depth of about 150 μm. The FRET strategy by coencapsulating AIE molecule and NIR dye will be helpful in preparing more narrow emission NIR probes for deep-tissue biological imaging.
  • 20.PREFACE
    摘要：Hydrogels are classical soft and wet materials that have been extensively studied over the past several decades.Recently,with the development of supramolecular science,nanotechnology and precisely synthetic chemistry,various novel hydrogels have been designed and fabricated,which show emerging applications in tissue engineering,drug delivery,anti-fouling coatings,flexible electronics and soft robotics.Through tailoring their two-dimensional surface structures and three-
  • 摘要：A sample containing different regions with poly(ε-caprolactone)(PCL), oriented polyethylene (PE), and oriented isotactic polypropylene (iPP) films in contact with glass slide has been prepared to be observed in the same view field in an optical microscope and the crystallization of PCL in different regions during cooling from 80 °C down to room temperature at a rate of 1 °C·min^-1 was studied. The results showed that the crystallization of PCL started first at the PE surface and then at the iPP surface, while its bulk crystallization occured much later. This indicates that though both PE and iPP are active in nucleating PCL, the nucleation ability of PE is stronger than that of iPP. This was due to a better lattice matching between PCL and PE than that between PCL and iPP. Moreover, since lattice matching existed between every (hk0) lattice planes of both PCL and PE but only between the (100)PCL and (010)iPP lattice planes, the uniaxial orientation feature of the used PE and iPP films resulted in the existence of much more active nucleation sites of PCL on PE than on iPP. This led to the fact that the nucleation density of PCL at PE surface was so high that the crystallization of PCL at PE surface took place in a way like the film developing process with PCL microcrystallites happened everywhere with crystallization proceeding simultaneously. On the other hand, even though iPP also enhanced the nucleation density of PCL evidently, the crystallization of PCL at iPP surface included still a nucleation and crystal growth processes similar to that of its bulk crystallization.
  • 摘要：A series of ternary blends of polypropylene/ethylene-propylene random copolymer/ethylene-propylene segmented copolymer(HPP/EPR/Eb P) whose microstructures are similar to those of impact polypropylene copolymer(IPC) were prepared in order to systematically investigate the effects of composition on microstructure and crystallization behavior of IPC. The observation of primary phase morphology reveals that the dispersed phase with core-shell structure could be rebuilt in certain composition and excessive EPR leads to a bicontinuous phase structure in ternary blends. After undergoing same quiescent crystallization including isothermal and non-isothermal crystallization, these blend samples exhibit special composition-dependent melting behavior, i.e., the melting point increases markedly with the increase of EPR content until it turns down at a critical content(about 30 wt%). The crystallization behavior is mainly ascribed to the different nucleation abilities. It is suggested that although the compatibility between EPR and HPP components becomes worse with the increase of EPR content due to the increased interfacial area and the decreased concentration of Eb P, higher EPR content in the blend facilitates to heterogeneous nucleation except for the appearance of obvious bicontinuous phase structure.
  • 摘要：A series of polyimide fibers containing phosphorus element derived from(3-aminophenyl) methyl phosphine oxide(DAMPO) diamine was exposed to an artificial atomic oxygen environment which simulated the space environment in low earth orbit(LEO). The mass loss, surface morphology, chemical composition, and mechanical properties of the fibers before and after atomic oxygen(AO) exposure were compared in detail with a blank sample. Results showed that the phosphor-containing fibers demonstrated lower mass change and less tensile strength reduction. SEM results showed that the fibers with phosphorous element had relatively dense surface after AO exposure. Meanwhile, XPS results indicated that a passivated phosphate layer, which could protect the following under-layer from attacking by AO, was formed on the surface of the fibers. These results indicated that the incorporation of diamine(DAMPO) into the main chains could protect the fibers for avoiding further erosion from AO exposure. Hence, the phosphor-containing PI fibers exhibits potential application in space fields.
  • 摘要：Ionic liquids(ILs)have appeared as the most promising electrolytes for lithium-ion batteries,owing to their unique high ionic conductivity,chemical stability and thermal stability properties.Poly(ionic liquid)s(PILs)with both IL-like characteristic and polymer structure are emerging as an alternative of traditional electrolyte.In this review,recent progresses on the applications of IL/PIL-based semi-solid state electrolytes,including gel electrolytes,ionic plastic crystal electrolytes,hybrid electrolytes and single-ion conducting electrolytes for lithium-ion batteries are discussed.
  • 摘要：Network polymers in a rubber or a gel often contain non-uniform chain lengths. By means of dynamic Monte Carlo simulations of polymer mixtures with various compositions of two chain lengths, we investigated how the factor of polydispersity influences their strain-induced crystal nucleation. Under a high temperature and a high strain rate, the stretching of both polymers revealed that crystal nucleation is mainly accelerated by the presence of short-chain polymers; nevertheless, both polymers join together in the nucleation process. Further analysis proved that crystal nucleation is initiated from those highly stretched short segments, which are rich on the short-chain polymers.
  • 摘要：Stretching polymer in fluid flow is a vital process for studying and utilizing the physical properties of these molecules,such as DNA linearization in nanofluidic channels.We studied the role of hydrodynamic interactions(His)in stretching a free star polymer in Poiseuille flow through a tube using mesoscale hydrodynamic simulations.As increasing the flow strength,star polymers migrate toward the centerline of tube due to His,whereas toward the tube wall in the absence of His.By analyzing the end monomer distribution and the perturbed flow around the star polymer,we found that the polymer acts like a shield against the flow,leading to additional hydrodynamic drag forces that compress the arm chains in the front of the star center toward the tube axis and lift the arm chai ns at the back toward the tube wall.The balanced hydrodynamic forces freeze the polymer into a trumpet structure,where the arm chains maintain a steady strongly stretched state at high flow strength.In contrast,the polymer displays remarkably large conformational change when switching off His.Our simulation results explained the coupling between His and the structure of star polymers in Poiseuille flow.
  • 摘要：Morphology and phase compositions of different starch-gelatin blends were investigated by various microscopes: optical, SEM and synchrotron FTIR microscopy. A high amylose(80%) corn starch, grafted with hydroxypropyl to enhance flexibilty and hydrophilicity, and plasticized by poly(ethylene glycol)(PEG), was used in this work. SEM revealed that the surface became smoother after adding PEG. Optical microscopy observation revealed that compatibility between gelatin and starch was improved by adding PEG. An FTIR beam focused on a 5 μm× 5 μm detection area by the micro-spectroscope was used to map chemical composition. The ratio of areas of the saccharide bands(1180–953 cm 1) and the amide I and II bands(1750–1483 cm 1) was used to monitor the relative distributions of the two components in the blends. The FTIR maps indicated that gelatin constituted the continuous phase up to 80% of starch content. All of the FTIR spectra showed contributions from both starch and gelatin absorptions, therefore indicating that complete demixing with pure starch and gelatin domains did not occur. The PEG improved the compatibility of the gelatin-starch blends.
  • 摘要：For the solid-solid transformation from form Ⅱ to form Ⅰ of isotactic polybutene-1(iPB),the temperature dependence of form Ⅰ nucleation and growth was deemed to control the transformation process.However,the relationship between formⅠ formation and form Ⅱ disappearance in the transformation process is not clear.In this work,the spontaneous crystal transformation from form Ⅱ to Ⅰ of iPB with 81 mol%mmmm sequence concentration is studied firstly by tracking the two processes,the decay of form Ⅱ and the yielding of form Ⅰ in a wide range of temperature spanning from 0℃ to 50℃ and in a long transformation time ranging from 5 min to 65 days with in situ FTIR and WAXD.Unlike the literature reports,the decay rate of form Ⅱ is firstly found to be lower than the yielding rate of form Ⅰ at all studied temperatures,especially at low transition temperature.This is attributed to the amorphous chains which locate near crystal lamella participating into the nucleation of form Ⅱ.The regular chain folding and growth of i PB form Ⅰ from amorphous chains containing short isotactic sequences also lead to an increase in crystallinity of form Ⅰ compared with that of initial form Ⅱ crystallized at 60℃.An increase in the annealing temperature results in decrease in crystallinity and increase in lamellae thickness of i PB formⅠ.
  • 摘要：A well-defined quadruple hydrogen bonding strategy involving dimerization of 2-ureido-4[1H]-pyrimidone(UPy)units is innovatively designed to prepare polyureas with high overall mechanical properties.Three polyureas containing different amounts of UPy units were synthesized by replacing a portion of isophorone diisocyanate(IPDI)with a UPy-derived diisocyanate.The formation of quadruple hydrogen bonds in hard segments via UPy dimers was confirmed by nuclear magnetic resonance(NMR)and Fourier transform infrared spectroscopy(FTIR).The mechanical properties of the polyureas were evaluated by uniaxial tensile testing.Compared to the polyurea without UPy units,remarkable improvements in Young’s modulus,tensile strength,and toughness were simultaneously achieved when UPy units were incorporated.The mechanism behind the strong strengthening effect rooted in the stronger intermolecular forces among hard segments brought by the quadruple hydrogen bonds,which were stronger than the inherent bidentate and monodentate hydrogen bonds among urea groups,and the slower soft segmental dynamics reaveled by both increased Tg and relaxation time of the soft segments.The mechanism behind the strong toughening effect was ascribed to more effective energy dissipation brought by the quadruple hydrogen bonds that served as stronger sacrificial bonds upon deformation.This work may offer new insight into the design of polyurea elastomers with comprehensively improved mechanical properties.
  • 摘要：Four new low-band-gap alternating copolymers(P-1, P-2, P-3 and P-4) based on electron-rich benzodithiophene and newly developed electron-deficient units, thienopyrazine or dithiadiazatrindene derivatives, were synthesized by Stille polycondensation. All polymers exhibit good solubility in common organic solvents and a broad absorption band in the visible to near-infrared regions. The film optical band gaps of the polymers are in the range of 1.28-2.07 eV and the highest occupied molecular orbital(HOMO) energy levels are in the range of-4.99 eV to-5.28 eV. Bulk heterojunction polymer solar cells(PSCs) of the polymers were fabricated with phenyl-C61-butyric acid methyl ester(PC61BM) as acceptor material, and a power conversion efficiency of 0.80% was realized with P-1 as donor material.

    高分子科学：英文版的期刊信息

    • 曾用名：Polymer Communications (1983-1986);Polymer Communucations;高分子科学(英文版);Chinese Journal of Polyer Science
    • 创刊时间：1983
    • 地区：CHINA MAINLAND
    • 语言：中文
    • 热门主题：POLY POLYMERIZATION POLYMER COPOLYMER BLENDS POLYSTYRENE COPOLYMERS POLYMERS COPOLYMERIZATION JOURNAL
    • 学科分类：

      2

      POLYMER SCIENCE:Q1;

      Chemical Engineering:Chemical Engineering (miscellaneous);Chemistry:Organic Chemistry;Materials Science:Polymers and Plastics;

    高分子科学：英文版的获奖情况

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    高分子科学：英文版的收录情况

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