polymerization

摘要： The dispersion of functional nanometer materials in polyolefin/clay nanocomposites is a key factor to determine the performances of mate-rials[1].In this research,the sepiolite with high specific surface area and good adsorption was introduced into the molybdenum-based butadiene polymerization system.Sepiolite-supporting MoCl5(Mo)function as the main catalysts,together with the alkyl aluminum(Al)substituted by m-cresol to form the butadiene coordination polymerization catalyst system to prepare high vinyl polybutadiene(HVPB)/sepiolite(Sep)nanocomposite.

摘要： Owing to the ongoing pandemic,the importance of and demand for antimicrobial textiles have reached new heights.In addition to being used for medical purposes,antimicrobial textiles could be a self-defense entity against microbes for the general population.Because textiles are widely used,they can effectively be used to prevent the spread of microbes worldwide.The conventional antibacterial finishing process of textiles is the wet treatment method using either the pad–dry–cure or exhaustion techniques.However,the textile wet treatment industries are major contributors to worldwide pollution,which is extremely concerning.Given the current and near-future high demand,it is imperative to include plasma in antimi-crobial finishing to achieve high efficiency in production,while retaining a safe environment.Hence,this paper reviews the rationale of plasma use in textile antimicrobial finishing through a critical analysis of recent studies and emphasizes the types and mechanisms of plasma techniques available for application.

摘要： Poly(ethylene glycol)-poly(n-butyl cyanoacrylate)(PEG-PBCA)is a remarkable drug delivery carrier for permeating blood-brain barrier.In this work,a novel high-gravity procedure was reported to intensify Knoevenagel condensation-Michael addition polymerization of PEG-PBCA.A series of PEG-PBCA containing different block ratios were synthesized with narrow molecular weight distribution of polydispersity indexes less than 1.1.Furthermore,the reaction time reduced 60%compared to conventional stirred tank reactor process.Chemical structures of as-prepared polymers were characterized.In vitro drug delivery performance was evaluated.The cytotoxicity of PEG-PBCA to brain microvessel endothelial cells(BMVEC)decreases with the extension of the PEG chain and the shortening of the PBCA chain.The polymer cellular uptake to BMVECs was better after improving hydrophilicity by PEG block.Results of bloodbrain barrier permeability demonstrated that medium length of PBCA chain and short PEG chain are favorable for hydrophobic Nile red permeation,while long PEG chain and short PBCA chain are beneficial to delivery water-soluble doxorubicin hydrochloride(Dox).The average apparent permeability coeffi-cient increased 1.7 and 0.25 times than that of raw Nile red and Dox,respectively.High-gravity intensi-fied condensation polymerization should have great potential in brain drug delivery system.

摘要： The production of poly-α-olefins(PAOs)has attracted attention due to their excellent viscosity-temperature dependence,wear characteristics,oxidative properties,and high thermal stability.In this study,indene extracted during coal tar refining was used as a raw material to synthesize a bis(indenyl)zirconium dichloride metallocene catalyst.A PAO with low viscosity and a high viscosity index was produced via the oligomerization of 1-decene in the presence of both the prepared metallocene and a methylaluminoxane(MAO)co-catalyst.Notably,the effects of different synthesis reaction parameters,such as Al:Zr ratio,amount of catalyst,and reaction temperature,on the conversion ratio and product selectivity were investigated in detail.The produced PAO was thoroughly characterized using Fourier-transform infrared,^(13)C,and^(1)H nuclear magnetic resonance spectroscopies;gas chromatography;and viscosity measurements.At 70°C,the metallocene catalyst created more stable active sites.In addition,the alkylation effect of MAO was noticeable.Interestingly,the obtained catalysis results demonstrated that a high conversion ratio of~93%was achieved at a low reaction temperature of 70°C,with a catalyst dosage of 0.0848 mmol and Al:Zr ratio of 8.48mmol:0.0848mmol.Moreover,under these optimal conditions,the kinematic viscosity of PAO was 4.25 mm2/s at 100°C,and the viscosity index was 139,indicating good viscosity-temperature properties.

摘要： The combined influence of chemical composition,molecular weight(MW)and molecular weight distribution(D)on the functions and performances of polymeric materials necessitates simultaneous satisfaction of multidimensional requirements during polymer synthesis.However,the complexity of polymerization reactions often dissuades chemists when precisely accessing diversified polymer targets.Herein,we developed a machine learning(ML)-assisted systematical polymerization planning(SPP)platform for addressing this challenge.With ML model providing integrated navigation of the reaction space,this approach can conduct multivariate analysis to uncover complex interactions between the polymerization result and conditions,prescribing optimal reaction conditions to achieve discretionary polymer targets concerning three dimensions including chemical composition,MWandD values.Given the increasing importance of polymerization in advanced material engineering,this ML-assisted SPP platform provides a universal strategy to access tailored polymers with on-demand prediction of polymerization parameters.

摘要： The controllable synthesis of polymers and macromolecules with precise structures is one of the biggest challenges in polymer chemistry[1].Although polymers with welldefined architectures and compositions could now be prepared by various living polymerization techniques[1],it remains elusive to produce macromolecular materials with precise controls of monomer sequences and easy purification procedures.

摘要： Since Ziegler,Hogan and Banks’seminal discoveries for the catalytic polymerization of olefins,many generations of catalysts have been reported[1–5].These include the transition from the original heterogeneous catalysts(Ziegler and Phillips)to homogeneous catalysts combining metallocene.

摘要： Coordinative chain transfer polymerization(CCTP)is a newly developed strategy that features similarly,but superiorly,to classical living polymerization,in other words,precise molecular weight controlling,narrow molecular weight distribution,atom economy and so on,and has been quickly grown as a powerful tool to prepare the target polymer materials[1].As an extension of this concept,the present study discloses our recent progresses on CCTP of butadiene(Bd)and isoprene(Ip)to prepare precisely controlled Bd/Ip copolymers.

摘要： Polyolefins are an indispensable class of materials that have become the most widely produced and utilized polymers today.They are readily synthesized from cheap and abundant monomer feedstocks,such as ethylene and propylene,and are capable of achieving a vast array of thermal and mechanical properties based upon their composition and topology.However,despite their numerous advantages, polyolefins are typically devoid of functional groups which can limit their applicability to many product families,such as coatings,adhesives,and cross-linked polyolefins.

摘要： Polyamide 6(PA6)/MMT nanocomposites prepared by in-situ polymerization and melt compounding methods were used in this smdy. The organoclay Polyamide 6 nanocomposites were then injection molded by conventional and microcellular methods.Carbon dioxide was used as the blowing agent.The effect of injection Screw speed,organoclay content,and preparation methods on the meehanical property was investigated.The results showed that the screw speed of the injection had major effect on the mechanical property of the nanocomposites：the higher the screw speed,the greater the tensile suength.The nanocomposites have maximum temile strength and cell density at a clay loading of 3 wt%and 5 wt%for in-situ polymerization and melt compounding respectively.The XRD results showed that the nanocomposites had no diffraction peaks when made by melt compounding.

摘要： A siloxane-acrylate micro-emulsion of muhipolymer was prepared by using of seed emulsion polymerization. The effects main factors such as emulsifier and initiator amounts, polymerization temperature, functional monomers amounts influencing the performances of emulsion have been discussed. The controlling parameters of high performances of micro-emulsion have been given.

摘要： 本发明公开了一种基于原位生长的Polymer‑COF‑MOF复合膜及其制备方法，该Polymer‑COF‑MOF复合膜具有层叠的多层膜结构，首先由COF配体和线性Polymer共聚形成聚合物共价有机骨架(Poly‑COF)，然后将聚合物共价有机骨架放置于金属中心离子前驱液中，加入带氨基的有机配体溶液后搅拌均匀，反应制得Polymer‑COF‑MOF复合膜；MOF膜层的形成过程中，该MOF膜层的金属中心离子通过与有机配体形成配位键，同时有机配体上的氨基与Poly‑COF膜层的羧基或者残存的醛基发生反应，实现MOF膜层在COF膜层上的原位生长；本发明提供的Polymer‑COF‑MOF多层复合膜中，Polymer、COF膜层之间通过共价键实现化学键合；MOF、COF膜层之间通过羧酸(或醛基)和氨基反应生成的酰胺键(或席夫碱)实现连接，结构稳定、机械强度更高。

摘要： 本发明提供了化合物DA‑I2959，结构如式(1)所示，聚合物DA‑Polymer，结构如式(2)所示，及所述化合物DA‑I2959、所述聚合物DA‑Polymer的制备方法。本发明还提供了一种所述的聚合物DA‑Polymer或者所述的制备方法得到的聚合物DA‑Polymer的使用方法。本发明进一步提供了一种油润滑材料。

摘要： 本发明公开了一种基于新型的Polymer‑COF‑rGO复合膜及其制备方法，首先由COF单体和线性Polymer制备含有聚合物的COF单体，然后将上述COF单体和另一种含有氨基的COF单体以及氧化石墨烯(GO)混合研磨，加入DMF和乙酸后加热反应，形成新的Polymer‑COF‑rGO复合膜。合成反应中两种COF单体形成COF材料，添加的氧化石墨烯(GO)在DMF溶液中原位还原，在加热条件下同时和COF材料中的氨基形成共价键连接在rGO和COF之间，实现rGO(还原氧化石墨烯)膜层在COF膜层上的原位生长。由于Polymer和COF膜层之间、COF和rGO膜层之间均是通过共价键实现连接，不仅有效将这两种类型的2D材料紧密结合在一起，而且还起到了“桥梁”的作用，改善COF光生电荷的分离以及光生电子向rGO的迁移。

摘要： 本发明公开了一种基于原位生长的Polymer‑COF‑MOF复合膜及其制备方法，该Polymer‑COF‑MOF复合膜具有层叠的多层膜结构，首先由COF配体和线性Polymer共聚形成聚合物共价有机骨架(Poly‑COF)，然后将聚合物共价有机骨架放置于金属中心离子前驱液中，加入带氨基的有机配体溶液后搅拌均匀，反应制得Polymer‑COF‑MOF复合膜；MOF膜层的形成过程中，该MOF膜层的金属中心离子通过与有机配体形成配位键，同时有机配体上的氨基与Poly‑COF膜层的羧基或者残存的醛基发生反应，实现MOF膜层在COF膜层上的原位生长；本发明提供的Polymer‑COF‑MOF多层复合膜中，Polymer、COF膜层之间通过共价键实现化学键合；MOF、COF膜层之间通过羧酸(或醛基)和氨基反应生成的酰胺键(或席夫碱)实现连接，结构稳定、机械强度更高。

摘要： 本发明提供了化合物DA‑I2959，结构如式(1)所示，聚合物DA‑Polymer，结构如式(2)所示，及所述化合物DA‑I2959、所述聚合物DA‑Polymer的制备方法。本发明还提供了一种所述的聚合物DA‑Polymer或者所述的制备方法得到的聚合物DA‑Polymer的使用方法。本发明进一步提供了一种油润滑材料。

摘要： 本发明涉及一种不锈钢毛细管和Polymer增敏结构的高频FBG加速度传感器及其使用方法，属于光电子测量技术领域。本发明包括聚四氟乙烯固定外壳、不锈钢毛细管、光纤Bragg光栅、导出光纤、弹性金属薄片；所述不锈钢毛细管外侧两边固定于聚四氟乙烯固定外壳空心圆筒中，把光纤Bragg光栅预拉伸后粘贴在弹性金属薄片上，粘贴有光纤Bragg光栅的弹性金属薄片放入不锈钢毛细管中央，导出光纤从不锈钢毛细管两边引出。本发明能够在较高的振动频率的基础上实现高灵敏度测量；本设计能够实现微小直径封装，可以适用于安装空间较小的测量对象中进行振动监测；通过采用光纤Bragg光栅，具有较强的抗电磁干扰能力和耐腐蚀能力适用于对变压器的长期监测；结构简单，便于操作。

摘要： 本实用新型公开了一种多功能新能源汽车储能电池Polymer电芯支架，包括支架本体，所述支架本体上设有与Polymer电芯外形结构相匹配的电芯深浅放置槽；所述支架本体的左右两侧分别设有定位孔柱；所述支架本体的前后两侧分别设有一个以上的喇叭散热槽；所述电芯深浅放置槽上设有预留膨胀槽孔。本实用新型结构简单，功能易行，增强Polymer电芯堆叠牢固，安全可靠整体结构。

摘要： 本实用新型涉及一种不锈钢毛细管和Polymer增敏结构的高频FBG加速度传感器，属于光电子测量技术领域。本实用新型包括聚四氟乙烯固定外壳、不锈钢毛细管、光纤Bragg光栅、导出光纤、弹性金属薄片；所述不锈钢毛细管外侧两边固定于聚四氟乙烯固定外壳空心圆筒中，把光纤Bragg光栅预拉伸后粘贴在弹性金属薄片上，粘贴有光纤Bragg光栅的弹性金属薄片放入不锈钢毛细管中央，导出光纤从不锈钢毛细管两边引出。本实用新型能够在较高的振动频率的基础上实现高灵敏度测量；本设计能够实现微小直径封装，可以适用于安装空间较小的测量对象中进行振动监测；通过采用光纤Bragg光栅，具有较强的抗电磁干扰能力和耐腐蚀能力适用于对变压器的长期监测；结构简单，便于操作。