• 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 and solid-state organization of coil-ring-coil block copolymers
【24h】

Synthesis and solid-state organization of coil-ring-coil block copolymers

机译：线圈-环-嵌段共聚物的合成及固态组织

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

Shape-persistent macrocycles based on the phenyl-ethynyl-butadienyl backbone containing two extraannular hydroxyl groups were prepared by the oxidative coupling of the appropriate phenylethynyl oligomers. Carbodiimidedirected coupling with independently synthesized polystyrene carboxylic acid oligomers led to ABA coil-ring-coil block copolymers in which the central macrocycle serves as rigid and the polystyrene oligomers as flexible elements. Depending on the size of the coil blocks, these structures aggregate in cyclohexane into supramolecular hollow cylindrical brushes in which the rigid core is surrounded by the flexible matrix. However, in the solid state it is not possible to identify a morphology in which isolated channels based on aggregated macrocycles are embedded in a matrix of polystyrene. Detailed X-ray and electron diffraction studies on samples prepared from a solution in cyclohexane under equilibrium conditions show that the material adopts a lamellar morphology in the solid state in which columns of macrocycles are aggregated into layers which are separated by polystyrene.
机译：通过适当的苯基乙炔基低聚物的氧化偶联，制备了基于含有两个环外羟基的苯基乙炔基丁二烯骨架的形状持久性大环。碳二亚胺定向偶联与独立合成的聚苯乙烯羧酸低聚物形成了ABA环-环-嵌段共聚物，其中中心大环为刚性，聚苯乙烯低聚物为柔性元素。根据线圈块的大小，这些结构在环己烷中聚集成超分子空心圆柱电刷，其中刚性芯被柔性基质包围。但是，在固态状态下，无法确定其中基于聚集的大环的孤立通道嵌入聚苯乙烯基质中的形态。对在平衡条件下从环己烷溶液中制备的样品进行的详细X射线和电子衍射研究表明，该材料在固态下呈层状形态，其中大环化合物的柱子聚集成由聚苯乙烯分隔的层。

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