• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Self organization of main-chain/side-chain liquid crystalline polymer based on 'jacketing' effect with different lengths of spacer: from smectic to hierarchically ordered structure
【24h】

Self organization of main-chain/side-chain liquid crystalline polymer based on 'jacketing' effect with different lengths of spacer: from smectic to hierarchically ordered structure

机译：主链/侧链液晶聚合物基于不同长度间隔物的“夹套”效应的自组织：从近晶到分层有序结构

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 series of combined main-chain/side-chain liquid crystalline polymers (MCSCLCP) based on "jacketing" effect, poly{(2,5-bis[n-(4-butoxy-40-oxybiphenyl)n-alkyl]oxycarbonyl}styrene) with different lengths of alkyl spacers (denoted as Pn, n represents the number of carbon atoms in the alkyl spacers, n = 2-10) have been successfully synthesized via atom transfer radical polymerization (ATRP). The chemical structures of Pns and the corresponding monomers were characterized using combined techniques with satisfactory analysis data. The phase structures and transitions of Pn were investigated using differential scanning calorimetry (DSC), polarized optical microscope (POM), and one-and two-dimensional wideangle X-ray diffraction (1D and 2D WAXD). It has been identified that P2 and P4 with short alkyl spacers form typical smectic phase. For n >= 6, Pns exhibit similar hierarchical ordered structure at low temperatures, bearing double orderings on the nanometer and sub-nanometer scales. In the hierarchical structure, the main-chains based on " jacketing" effect form a 2D centered rectangular scaffold, and the side-chain biphenyl mesogens within the scaffold pack into a smectic E-like structure. The a dimension of rectangular lattice enlarges with n. When the temperature is increased, different from P6, P8 and P10 present the same phase behavior, forming smectic B-like packing of side chains and maintaining their main-chain scaffold until isotropization.
机译：基于“夹套”效应的一系列组合的主链/侧链液晶聚合物（MCSCLCP），聚{（2,5-双[n-（4-丁氧基-40-氧联苯）n-烷基]氧羰基}苯乙烯）具有不同长度的烷基间隔基（表示为Pn，n表示烷基间隔基中的碳原子数，n = 2-10），已通过原子转移自由基聚合（ATRP）成功合成。使用具有满意分析数据的组合技术对Pns和相应单体的化学结构进行了表征。使用差示扫描量热法（DSC），偏振光学显微镜（POM）以及一维和二维广角X射线衍射（1D和2D WAXD）研究了Pn的相结构和跃迁。已经确定具有短的烷基间隔基的P2和P4形成典型的近晶相。对于n> = 6，Pns在低温下表现出相似的分层有序结构，在纳米和亚纳米尺度上具有双重次序。在分层结构中，基于“护套”效应的主链形成一个二维居中的矩形支架，而支架内的侧链联苯介晶基团则包装成近晶E型结构。矩形晶格的a尺寸随n增大。当温度升高时，不同于P6，P8和P10表现出相同的相行为，形成侧链的近晶B状堆积并保持其主链支架直至各向同性。

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