Radical polymerization behavior and molecular weight development of homologous monoacrylate monomers in lyotropic liquid crystal phases
Radical polymerization behavior and molecular weight development of homologous monoacrylate monomers in lyotropic liquid crystal phases
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同系单丙烯酸酯单体在溶致液晶相中的自由基聚合行为和分子量发展
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Guymon
中科院分区：
文献类型：
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作者：
M. Depierro;C. Baguenard;C. Guymon
在高度有序的溶致液晶(LLC)介质中聚合，可以控制合成具有有趣的纳米结构和物理性能的聚合物。本研究考察了不同脂肪族尾长的单丙烯酸酯在一系列LLC相中的自由基聚合速率和相对分子质量(MW)的发展。用光差示扫描量热法测定聚合速率数据，用凝胶渗透色谱测定线型聚合物的相对分子质量。与各向同性溶液和整齐聚合相比，聚合反应速度更快，并且在有序的LLC相中获得了更高的相对分子质量。这些性质随着LLC相和单体结构的变化而显著变化。观察到聚合物相对分子质量的形成与聚合速率之间存在直接关系。在相界面上观察到了速率和相对分子质量的明显变化，表明了溶剂有序的重要作用。这项研究展示了如何利用溶剂有序效应来控制聚合物的相对分子质量和聚合速度。©2015威利期刊公司J.Polym。科学，A部分：多晶硅。化学。2016、54、144-154
Polymerization in highly ordered lyotropic liquid-crystalline (LLC) media enables controllable synthesis of polymers possessing interesting nanostructure and physical properties. This study investigates the radical polymerization rate and molecular weight (MW) development of monoacrylates of different aliphatic tail length in a range of LLC phases. Polymerization rate data were acquired using photodifferential scanning calorimetry, and linear polymer MW was determined with gel permeation chromatography. Polymerization occurs much more rapidly, and higher MW is attained in the ordered LLC phases relative to isotropic solutions and neat polymerization. These properties change significantly as a function of LLC phase and monomer structure. A direct relationship is observed between polymer MW formation and the polymerization rate. Definitive changes in rate and MW were observed at phase boundaries, indicating the important role of solvent order. This study demonstrates how solvent ordering effects can be used to control polymer MW and rate of polymerization. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 144–154