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Anionic Chain-Growth Polymerization: Overview01:20

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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

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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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通过桥梁聚合物链改善复杂的合体组织粘合性能.

Ayla N Kwant1,2,3,4, Julien S Es Sayed1,5, Nawal Aledlbi6,7

  • 1Polymer Science, Zernike Institute for Advanced Materials (ZIAM), University of Groningen, Groningen 9747AG, The Netherlands.

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概括
此摘要是机器生成的。

桥梁聚合物增强复杂的协同体粘合剂 (CCA) 用于组织修复. 用聚胺化物 (pAH) 进行预处理,通过形成桥梁层,改善了动态组织的粘附性,增加了强度.

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科学领域:

  • 生物材料科学 生物材料科学
  • 聚合物化学 聚合物化学
  • 组织工程是组织工程.

背景情况:

  • 复杂的协体 (CCA) 显示出由于调节性质和湿粘合性,作为组织粘合剂具有前途.
  • 保持在柔软,动态的生物组织上稳定的粘附是当前CCA面临的重大挑战.

研究的目的:

  • 调查使用桥梁聚合物来增强聚胺化物 (pAH) 和聚硫烯基甲基酸盐 (pSPMA) 基CCA的粘合性能.
  • 了解桥梁聚合物改善CCA在生物基质上的附着性的机制.

主要方法:

  • 从pAH和pSPMA制造CCA,通过盐度变化固化.
  • 用pAH或pSPMA预处理模型水凝和生物组织.
  • 测量粘附能量和分析聚合物界面分布.

主要成果:

  • 用pAH进行预处理,但不是pSPMA,显著增强了水凝和组织的粘附能量.
  • 聚合物丰富的桥梁层在接口上形成,这是由于pAH在表面层中的积累造成的.
  • 该pAH桥梁层增加了CCA在故障之前承受变形的能力.

结论:

  • 桥梁聚合物,特别是pAH,可以显著改善CCA在动态组织上的粘附性.
  • 该机制涉及形成一个接口桥梁层,增强机械强度.
  • 这一战略有可能推动CCA和其他生物医学粘合剂的发展.