• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Novel cholesteric liquid crystalline elastomers containing dimer type nematic and chiral liquid crystalline side-chains
【24h】

Novel cholesteric liquid crystalline elastomers containing dimer type nematic and chiral liquid crystalline side-chains

机译：含有二聚体型向列和手性液晶侧链的新型胆甾型液晶弹性体

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new set of cholesteric side chain liquid crystalline elastomers (ChLCEs) E-1-E-7 were graft copolymerized by hydrosilylation reaction with poly(methylhydrogeno)siloxane, nematic monomer (M-1), chiral monomer (M-2), 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 M-1, M-2 and CL were carefully examined by Fourier transform infrared (FT-IR), elemental analysis (EA), proton nuclear magnetic resonance spectroscopy (H-1 NMR); and their mesomorphic phases were determined by observation using polarizing optical microscopy (POM), and double confirmed by calculations from the results of Xray diffraction (XRD). The helical structure of combining the chiral and achiral liquid crystalline side chains endowed the obtained ChLCEs with cholesteric liquid crystalline properties. By tailoring the dosage of the crosslinking agent, the mesomorphic properties of ChLCEs could be adjusted. The mesophase-isotropic phase ranges of the ChLCEs were gradually narrowed with the increasing addition of CL according to differential scanning calorimetry (DSC). Thermal analysis (TG) results showed the temperatures at which 5% weight loss occurred were greater than 300 degrees C for all the ChLCEs. The effective crosslink density ((M) over bar (c)) of the ChLCEs was characterized by swelling experiments showing that the molecular weight between the crosslinking points decreases with the increase of the CL. Fourier transform infrared imaging (FT-IR imaging) and FT-IR indicate the functional groups of all the ChLCEs are finely distributed.
机译：通过与聚（甲基氢）硅氧烷，向列型单体（M-1），手性单体（M-2）和聚甲基丙烯酸甲酯的氢化硅烷化反应，将一组新的胆甾型侧链液晶弹性体（ChLCE）E-1-E-7接枝共聚。交联剂（CL）。这两个单体都是二聚体，并且手性2-辛基末端基团首先用于ChLCE系统。 M-1，M-2和CL的化学结构通过傅里叶变换红外（FT-IR），元素分析（EA），质子核磁共振波谱（H-1 NMR）仔细检查;通过使用偏光光学显微镜（POM）观察确定它们的同质相，并通过X射线衍射（XRD）的结果通过计算再次确认。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的失重5％都高于300摄氏度。 ChLCE的有效交联密度（（M）相对于条（c））通过溶胀实验表征，表明交联点之间的分子量随CL的增加而降低。傅立叶变换红外成像（FT-IR成像）和FT-IR表示所有ChLCE的功能团均精细分布。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号