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Phase behaviour of hyperbranched polymers in demixed solvents

机译:超支化聚合物在混合溶剂中的相行为

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Hyperbranched polymers have attracted increased interest because of their tunable properties, which are affected by their architecture and a wide range of different functional groups. Many applications of hyperbranched polymers have been proposed based on their liquid-liquid phase behaviour. In recent years, the Lattice Cluster Theory (LCT) has been used to consider the impact of the architecture on the phase behaviour of hyperbranched polymers. In the theoretical framework of the LCT, the chain architecture is included in the Helmholtz energy, so all derived properties are influenced by polymer architecture. Until now, the application of the LCT in the field of hyperbranched polymers has been limited to ternary systems composed of one polymer with an arbitrary chain structure, one trimer and one solvent. This paper aims to extend the LCT to a ternary system that includes two polymers with an arbitrary chain structure and one solvent occupying one lattice site. In contrast to previous studies, the ternary system consists of Boltorn H20 + butan-1-ol + water, where all of the binary subsystems show demixing behaviour. Whereas experimental data are reported in the literature for the binary subsystems Boltorn H20 + water and butan-1-ol + water, no experimental information is available for the binary subsystem Boltorn H20 + butan-1-ol. Therefore, the phase behaviour of this subsystem was measured using the visual method. The paper discusses the possibility of predicting the ternary phase behaviour with the LCT in combination with the modified Wertheim theory based on knowledge of the phase behaviour of the corresponding binary subsystems. To verify the theoretical results, the ternary phase equilibria at constant temperature were also measured. In addition, the dependence of the thermodynamic properties on the special production lot of the commercially available Boltorn H20 is discussed.View full textDownload full textKeywordsLattice Cluster Theory, hyperbranched polymers, liquid-liquid equilibria, theory of liquids, Wertheim theoryRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00268976.2011.648964
机译:超支化聚合物由于其可调节的特性而受到越来越多的关注,这些特性受其结构和各种不同官能团的影响。基于超支化聚合物的液相-液相行为,已经提出了许多应用。近年来,已使用晶格簇理论(LCT)来考虑体系结构对超支化聚合物的相行为的影响。在LCT的理论框架中,链结构包含在亥姆霍兹能量中,因此所有衍生的特性都受聚合物结构的影响。到目前为止,LCT在超支化聚合物领域的应用仅限于由一种具有任意链结构的聚合物,一种三聚体和一种溶剂组成的三元体系。本文旨在将LCT扩展到三元体系,该体系包括两种具有任意链结构的聚合物和一种占据一个晶格位的溶剂。与以前的研究相比,三元系统由Boltorn H20 + +丁丹-1-醇+ +水,其中所有二元子系统都显示出混合行为。尽管在文献中报告了二元子系统Boltorn H20 +水和butan-1-olâ+水的实验数据,但是没有实验信息可用于二元子系统Boltorn H20 + +水。 €butan-1-ol。因此,使用视觉方法测量了该子系统的相位行为。本文基于对相应二元子系统的相态知识的了解,结合改进的Wertheim理论讨论了使用LCT预测三元相态的可能性。为了验证理论结果,还测量了恒温下的三元相平衡。此外,还讨论了热力学性质对市售Boltorn H20特殊生产批次的依赖关系。 :“ Taylor&Francis Online”,services_compact:“ citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more”,pubid:“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/00268976.2011.648964

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