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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Coil-Rod-Coil刚柔嵌段共聚物在选择性溶剂中的自组装
DOI: 10.3724/SP.J.1105.2014.13327, PP. 514-522
Keywords: 耗散粒子动力学,Coil-Rod-Coil,选择性溶剂,自组装,界面能
Abstract:
采用耗散粒子动力学方法（dissipativeparticledynamics，DPD）研究了coil-rod-coil（CRC）三嵌段刚柔共聚物在选择性溶剂中的自组装.在链选择性溶剂中，刚性棒长Lr与柔性链长Lc都影响着CRC溶液的自组装及相转变.随Lr的增大，棒与溶剂的接触面变大界面能升高，为减小体系的自由能，棒嵌段趋向聚集以减少接触面与界面能.随Lc的增大，链的自由伸展构象熵增大，影响着棒嵌段聚集体结构的形成，使棒嵌段的分布更加分散.在研究溶剂性质aCS与棒长Lr对体系自组装影响的情况中，观察到两类有趣的相结构球形相和胶束相.随着参数aCS从亲链变为中性再到亲棒，在球形相内部，不仅棒相区由球体内部移向球表面，而且棒相区与链相区的层次分布也发生了明显地变化.同样，Lr的改变也影响着球形相内部相区的分布，同时诱导了不同球形相间的构型转变.胶束相包括分段胶束和螺旋胶束两种，形成于棒长较长的情况，胶束相中棒嵌段的排列呈现出明显的液晶相结构.
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