New amphiphilic polycarbonates with side functionalized cholesteryl groups as biomesogenic units: synthesis, structure and liquid crystal behavior
作者:Xiaoxu Xu、Xiaofeng Liu、Qun Li、Jianshe Hu、Qifan Chen、Liqun Yang、Yanhua Lu
DOI:10.1039/c7ra00360a
日期:——
functionalized-cholesterol based aliphatic polycarbonates is described through the ring-opening polymerization and coupling reaction. The chemical structures, liquid crystal (LC) behavior, and thermal stability of the chiral monomers and copolymers obtained in this study were characterized using Fourier transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, gel
通过开环聚合和偶联反应描述了具有侧基官能化胆固醇基脂族聚碳酸酯的四种新型两亲共聚物的合成。使用傅里叶变换红外(FT-IR)光谱,质子核磁共振(1H NMR)光谱,凝胶渗透色谱(GPC),偏振光学显微镜(POM),差示扫描量热法(DSC),X射线衍射(XRD)和热重分析(TGA)测量。研究了间隔长度对手性单体和共聚物的分子相互作用和中间相的影响。发现具有更长间隔基的手性单体似乎对于中间相的形成是有益的,并且聚合反应的附加有序性导致中间相比相应的单体更有序。LC共聚物都显示出具有指状分子排列的近晶A相。结果似乎表明,通过增加间隔物的长度,可降低LC共聚物的玻璃化转变温度和各向同性温度。此外,