Novel cholesteric liquid crystalline elastomers containing dimer type nematic and chiral liquid crystalline side-chains
作者:Ying Jiang、Yuehua Cong、Baoyan Zhang
DOI:10.1039/c6ra19330g
日期:——
(ChLCEs) E1–E7 were graft copolymerized by hydrosilylation reaction with poly(methylhydrogeno)siloxane, nematic monomer (M1), chiral monomer (M2), and crosslinking agent (CL). The two monomers were both dimers, and the chiral 2-octyl terminal group was firstly used in the ChLCE systems. The chemical structures of M1, M2 and CL were carefully examined by Fourier transform infrared (FT-IR), elemental analysis
通过与聚(甲基氢)硅氧烷,向列型单体(M 1),手性单体(M 2)和交联剂(CL)进行氢化硅烷化反应,将一组新的胆甾型侧链液晶弹性体(ChLCEs)E 1 -E 7接枝共聚。)。两种单体均为二聚体,并且在ChLCE系统中首先使用了手性2-辛基端基。通过傅立叶变换红外(FT-IR),元素分析(EA),质子核磁共振波谱(1)仔细检查了M 1,M 2和CL的化学结构(11 H NMR); 并通过偏光光学显微镜(POM)观察确定了它们的同质相,并通过X射线衍射(XRD)的计算再次确认了它们的同晶相。手性和非手性液晶侧链结合的螺旋结构使获得的ChLCE具有胆甾型液晶性质。通过调整交联剂的用量,可以调节ChLCE的介晶性质。根据差示扫描量热法(DSC),随着CL的增加,ChLCE的中间相各向同性相范围逐渐缩小。热分析(TG)结果表明,所有ChLCE的5%失重发生时的温度均大于300°C。有效交联密