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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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机械激活的,无催化剂的多氨玻璃剂

David J Fortman1, Jacob P Brutman2, Christopher J Cramer2

  • 1Department of Chemistry and Chemical Biology, Cornell University , Baker Laboratory, Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|October 27, 2015
PubMed
概括

新的聚氨酸 (PHU) 玻璃具有与热固体相似的特性,可以在没有催化剂的情况下重塑. 这些先进的聚合物网络在再加工后具有出色的机械强度和可回收性,为可持续材料铺平了道路.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 有机化学

背景情况:

  • 玻璃体是具有催化剂诱导的交叉链交换的动态聚合物网络,可进行再处理.
  • 传统的热具有高性能,但缺乏可回收性.
  • 聚氨酸 (PHU) 通常由异酸盐和聚醇形成,这引发了安全问题.

研究的目的:

  • 开发一种基于循环碳酸盐和氨基的聚氨酸 (PHU) 的新类玻璃制剂.
  • 研究这些新型PHU玻璃器的再加工能力和机械性能.
  • 阐明PHU玻璃体中压力放松和无催化剂修复的机制.

主要方法:

  • 从六个成员的循环碳酸盐和氨基酸合成PHU网络.
  • 合成和再加工网络的机械测试 (拉伸性质).
  • 应力放松测量和动力分析 (Arrhenius激活能量).
  • 密度函数理论 (DFT) 的计算,以研究转碳化机制.

主要成果:

  • PHU玻璃具有与领先的热固体相比较的拉伸性能.
  • 网络可以在没有外部催化剂的情况下在高温和高压下进行再处理.
  • 再加工的PHU玻璃回收了大约75%的原始机械性能.
  • 压力放松通过关联性转碳化发生,激活能量低于模型化合物 (111 ± 10 kJ/mol).
  • DFT计算表明机械应力通过破坏N个单对对联来激活转碳胺.

结论:

  • PHU玻璃体是一种有前途的可修复和可回收聚合物网络.
  • 这些材料提供了卓越的机械性能,不需要有毒的异酸盐单体.
  • 它们的无催化剂再加工和修复能力突出显示了它们在可持续材料应用中的潜力.