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相关概念视频

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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制造可远程控制的动态离子体/CNT网络,通过子-π相互作用实现多响应形状记忆和自我修复能力.

Yi Xiao1, Dan Liu1, Ling-Ying Shi2

  • 1The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.

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概括

这项研究引入了一种新的离子体/碳纳米管复合物,用于先进的形状记忆聚合物 (SMP). 这些材料提供远程可控的形状记忆效果和自我修复,这对于智能设备至关重要.

关键词:
电离π 相互作用离子体是什么? 离子体是什么?多响应式多响应式它具有自我愈合的功能.形状记忆的聚合物聚合物.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 纳米技术纳米技术

背景情况:

  • 形状记忆聚合物 (SMP) 对于生物医学和航空领域的执行应用至关重要.
  • 遥控触发是高级SMP应用程序的关键要求.

研究的目的:

  • 开发一种新的离子体/碳纳米管 (CNT) 复合网络,具有增强的形状记忆效应 (SME) 和自我修复能力.
  • 为了改善材料性能,研究离子集群和阴离子-π相互作用的协同效应.

主要方法:

  • 通过对四分位氨 (QA) 单元与晶体聚烯酸 (PCL) 片段进行共聚性结合,合成PCLQA离子体.
  • 将多反应性碳纳米管 (CNT) 嵌入PCLQA矩阵中,以形成PCLQA@CNT复合材料.
  • 描述了开发的复合材料的机械性能,形状记忆性能和抗菌作用.

主要成果:

  • PCLQA@CNT复合材料表现出优越的机械性能 (抗拉强度> 40 MPa,破裂延伸> 1900%).
  • 获得了优异的热诱导SME,具有高形状固定性 (99.6%) 和回收性 (92.3%).
  • 通过远程刺激 (NIR和电气) 显示出显著的抗菌活性 (>99%) 和自我愈合能力.

结论:

  • 新型PCLQA@CNT网络由离子集群和阴离子-π相互作用稳定,提供强大的,可远程控制的形状记忆和自我修复特性.
  • 该材料的增强性能和多功能性为先进的智能设备铺平了道路.
  • 这项研究强调了离子体/CNT复合材料在下一代智能材料中的潜力.