摘要
用热台偏光显微镜、X射线衍射和DSC研究了含胆甾介晶基元和偶氮苯光色基元侧链共聚硅氧烷(PSI)的液晶性.将非介晶基元并入液晶均聚物,所得共聚物的液晶态类型不变,仍显示近晶型织构,在PSI共聚物中,保持液晶性的含介晶基元单体的最低极限组成为60mol%.在液晶性存在的范围内,共聚物的清亮点由130℃升至170℃,液晶共聚物的热稳定性随非介晶组分含量的增加而增强.
The liquid crystalline properties of side-chain copolysiloxanes containing cholesteric mesogens and azobenzene photochromic groups were characterized by polarized microscopy with a hot stage (POM), DSC and WAXD. On incorporation of nonmesogenic units into LC polysiloxane the type of mesophase is not changed and smectic texture is preserved for copolysiloxanes PSI-2-8. Composition limit for mesophase existence of copolysiloxanes of mesogenic monomers with monomers, that do not contain mesogenic fragments, is to be 60 mol%. In the composition region of mesophase existence the clearing temperature of copolysiloxanes varies from 130℃ into 170℃ and mesophase thermostability is increased by the increasing nonmesogenic component content of copolysiloxanes.
出处
《高等学校化学学报》
CSCD
北大核心
1994年第8期1240-1243,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
中国科学院高分子物理联合开放实验室(化学所)科学基金
关键词
液晶
共聚
硅氧烷
光致变色
高聚物
Thermotropoc liquid crystalline polymer
Side-chain copolysiloxane
Smectic phase
Cholesteric mesogens