甲壳型液晶共聚物在超临界二氧化碳中的多尺度自组装结构

项目名称： 甲壳型液晶共聚物在超临界二氧化碳中的多尺度自组装结构

项目编号： No.20874003

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 生物科学

项目作者： 沈志豪

作者单位： 北京大学

项目金额： 38万元

中文摘要： 本项目旨在通过研究超临界二氧化碳对甲壳型液晶均聚物和嵌段共聚物的相行为和多尺度自组装的影响，总结化学结构、拓扑结构、共聚物中均聚物的相对含量、分子量、二氧化碳处理条件等对自组装结构的影响，为制备特定的、具有高有序度及实际应用前景的多尺度自组装结构奠定科学理论基础。通过本项目的研究，取得的主要成果有：（1）首次实现了利用超临界二氧化碳对含亲二氧化碳链段的刚柔嵌段共聚物自组装结构的调控；（2）首次合成得到了具有聚硅氧烷主链的甲壳型液晶高分子；（3）设计合成了一类新型的刚刚型嵌段共聚物，并获得了其多层次自组装结构随组成变化的演变规律。以上研究成果对利用超临界流体得到具有微纳有序结构的高分子材料、预测甲壳型液晶高分子的相态结构、调控刚刚嵌段共聚物的多层次自组装结构等具有指导意义。

中文关键词： 甲壳型液晶高分子；相变行为；超临界二氧化碳；嵌段共聚物；多尺度自组装

英文摘要： The objective of this project is to provide scientific and theoretical foundation for making specific, highly-ordered, and potentially useful hierarchical self-assembled structures by investigating the influence of supercritical carbon dioxide on the phase behavior and hierarchical self-assembly of mesogen-jacketed liquid crystalline homopolymers and block copolymers and by summarizing the effects of chemical structure, architecture, homopolymer composition in block copolymers, molecular weight, and carbon dioxide processing conditions on the self-assembled structures. Through the execution of this project, we have accomplished the following major achievements: (1) realized the control of self-assembled structures of rod-coil block copolymers with a carbon dioxide-philic block using supercritical carbon dioxide for the first time; (2) synthesized mesogen-jacketed liquid crystalline polymers with polysiloxane backbone for the first time; (3) designed and synthesized a new type of rod-rod block copolymers and found the dependence of hierarchical self-assembled structures on composition. The above results are important for obtaining polymeric materials with micro/nano-ordered structures with supercritical fluids, predicting the phase structures of mesogen-jacketed liquid crystalline polymers, and controlling the hierarchical self-assembled structures of rod-rod block copolymers.

英文关键词： Mesogen-jacketed liquid crystalline polymers; Phase transition behaviors; Supercritical carbon dioxide; Block copolymes; Hierarchical self-assembly