• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Synthesis,Liquid-Crystalline Properties,and Supramolecular Nanostructures of Dendronized Poly(isocyanide)s and Their Precursors
【24h】

Synthesis,Liquid-Crystalline Properties,and Supramolecular Nanostructures of Dendronized Poly(isocyanide)s and Their Precursors

机译：树状化聚异氰酸酯及其前体的合成，液晶性能和超分子纳米结构

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 novel dendronized pi-conjugated poly(isocyanide)s were synthesized successfully by using a Pd-Pt mu-ethynediyl dinuclear complex ([ClPt{P(C_2H_5)_3)_2C ident to CPt-{P(C_2H_5)_3}_2C1]) as the initiator.The polymerizations of the dendronized monomers follow first-order kinetics,indicating that living polymerization takes place.The obtained polymers exhibit narrow polydispersities in the range of 1.03-1.20.Thermal properties of the poly(isocyanide)s as well as their isocyanide monomers and precursors with formamido (HCONH-) moieties as apexes were investigated by using differential scanning calorimetry (DSC),polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD).Both the peripheries and the apex groups of the dendrons affect the formation of supramolecular column and/or cubic phases of the precursors and monomers.The formamido precursor forms a liquid-crystalline phase due to intermolecular hydrogen bonding.The isocyanide monomer lacks this hydrogen-bonding ability and does not display an organized meso-phase.All of the rigid poly(isocya-nide)s with the monodendrons exhibit columnar liquid-crystalline phases.Interestingly,cylindrical structures of a poly(isocyanide) were directly visualized by using transmission electron microscopy (TEM).
机译：通过使用与CPt- {P（C（H_2H_5）_3} _2C1相同的Pd-Pt乙炔二基双核络合物（[ClPt {P（C_2H_5）_3）_2C与Cd-Pt {P（C（C_2H_5）_3} _2C1 ]）作为引发剂。枝状单体的聚合反应遵循一级动力学，表明发生了活性聚合反应。获得的聚合物在1.03-1.20的范围内表现出窄的多分散性。聚异氰酸酯的热性质也是如此通过差示扫描量热法（DSC），偏振光学显微镜（POM）和广角X射线衍射（WAXD）研究了它们作为异氰酸酯单体和具有甲酰胺基（HCONH-）顶点的前体。树枝状基团影响前体和单体的超分子柱和/或立方相的形成。甲酰胺基前体由于分子间氢键而形成液晶相。异氰酸酯单体缺乏这种氢键g的能力，并且不显示有组织的中间相。所有具有单树枝的刚性聚异氰胺均显示柱状液晶相。有趣的是，使用透射电子可以直接观察到聚异氰酸酯的圆柱结构显微镜（TEM）。

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