• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Change in crystal structure and polymerization reactivity for the solid-state polymerization of muconic esters
【24h】

Change in crystal structure and polymerization reactivity for the solid-state polymerization of muconic esters

机译：粘康酸酯固态聚合的晶体结构和聚合反应性的变化

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

We report the polymerization mechanism and kinetics of muconic esters as the 1,3-diene monomers during solid-state polymerization via a crystal-to-crystal transformation. We have revealed a change in the structure of the muconate crystals accompanying the shrinking and expanding of the lattice lengths, on the basis of the X-ray single-crystal structure analysis of the monomers and polymers as well as a change in the transient structure monitored by powder X-ray diffraction during the continuous X-ray radiation. The polymerization rate is closely related to the molecular stacking distance in the monomer crystals because the polymer chain skeletons have the same conformational structure in the crystals. A lattice length in the direction along which a polymer chain is produced decreases during the transformation from monomer to polymer crystals when monomer molecules are arranged in a columnar assembly with a stacking distance greater than the fiber period of the resulting polymer, and vice versa. A strain in the crystals is formed by a mismatch between the monomer and polymer crystal lattices accumulated and then finally released during the polymerization.
机译：我们报告了固态聚合过程中通过晶体到晶体的转变，粘康酸酯作为1,3-二烯单体的聚合机理和动力学。根据单体和聚合物的X射线单晶结构分析以及监测到的瞬态结构的变化，我们发现了随晶格长度的收缩和扩展而发生的粘液晶体的结构变化。在连续的X射线辐射过程中通过粉末X射线衍射产生的。聚合速率与单体晶体中的分子堆积距离密切相关，因为聚合物链骨架在晶体中具有相同的构象结构。当单体分子以柱状组件排列且堆积距离大于所得聚合物的纤维周期时，在从单体到聚合物晶体的转变过程中，沿着产生聚合物链的方向的晶格长度减小。晶体中的应变是由积累的单体和聚合物晶格之间的不匹配形成的，然后在聚合过程中最终释放出来。

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