Fluorescence Study on Microstructure and Phase Transition Dynamic of Polymer Gels and Polymer Liquid Crystals

本研究旨在利用荧光法研究聚合物凝胶和聚合物液晶的微观结构和动力学。主要研究结果如下：1）通过引入丹磺酰探针，研究了聚丙烯酰胺和聚N-异丙基丙烯酰胺凝胶的荧光光谱和荧光去极化。此外，委员会认为，2）首次以含羟基的芳香族聚酰亚胺和二异氰酸酯为交联剂制备了一种新型的热稳定性聚酰亚胺凝胶; 3）对不同类型的液晶聚合物和低分子量的液晶聚合物进行了荧光光谱研究，并对液晶聚合物中液晶基元间的微观结构及其动力学进行了研究。分子量液晶。4）将荧光技术应用于其他具有纳米级有序结构的聚合物体系和反胶束体系。

This research was carried out in order to elucidate microstructure and dynamics of polymer gels and polymer liquid crystals by using fluorescence method. The following results were obtained.1)Fluorescence spectra and fluorescence depolarization of polyacrylamide and poly-N-isopropylacrylamide gels were studied by incorporating a dansyl probe. Moreover, deuterium substitution effect was studied for elucidating the role of hydrogen bonding in expansion of collapse of the polymer gels.2)A new thermostable polyimide gel was first prepared from an aromatic polyimide with hydroxyl groups and diisocyanate crosslinker.3)Fluorescence study on microstructure between mesogenic groups in main-chain aromatic liquid crystalline polymers and their dynamics was carried out for various-type LC polymers and low-molecular-weight liquid crystals. Photo-control of cholesteric liquid crystals by using photoinversion of a chiral sulfoxide was also realized.4)Fluorescence technique was also applied to other polymer systems with nano-scale ordered structure and inverted micelle systems.