connected building blocks, namely MJLCP and POSS moieties, PNb10POSS shows various phase structures including an angstrom POSS crystal (Cr), a hexagonal columnar (Colh) phase and the Cr coexisting, and the Colh phase at different temperatures. The POSS crystal has a tremendous effect on the liquid crystalline (LC) behavior of the MJLCP. The results show that the competition between the crystallization
通过开环易位聚合反应,合成了在侧链中包含多面体低聚倍半
硅氧烷(POSS)的聚
降冰片烯基介晶夹层液晶聚合物(MJLCP)。单体的
化学结构通过1 H / 13 C NMR,高分辨率质谱和元素分析确认。用1对聚合物进行分子表征1 H NMR,凝胶渗透色谱和热重分析。通过差示扫描量热法,偏光显微镜,一维广角X射线散射,同步辐射小角X射线散射(
SAXS),二维研究了这种新型有机-无机杂化聚合物的相行为。广角X射线衍射和高分辨率透射电子显微镜。
PNb10POSS具有两个共价连接的结构单元(即MJLCP和POSS部分)的竞争性自组装,因此显示出各种相结构,包括埃POSS晶体(Cr),六方柱状(Col h)相和Cr共存,以及Col H在不同温度下的相。POSS晶体对MJLCP的液晶(LC)行为具有巨大影响。结果表明,POSS的结晶与整个聚合物的LC形成之间的竞争导致了基于MJLCP的纳米杂化物的复杂相行为