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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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通过立体微观结构调节的可生物降解粘合剂

Zhen Zhang1, Ethan C Quinn1, Jacob K Kenny2,3

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO, USA.

Science (New York, N.Y.)
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概括

可生物降解的聚3-乙酸 (P3HB) 具有丰富的合成结构,具有较高的粘合性,性能优于商业粘合剂. 这种可持续的替代方案不论是分子重量还是重复使用都具有前景.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 生物材料工程

背景情况:

  • 传统的粘合剂是以石油为基础的,不可生物降解,并引起环境问题.
  • 聚3-酸 (P3HB) 是一个有前途的生物可再生和生物可降解的聚合物替代品.
  • 微生物P3HB由于其立体特异性的微观结构而缺乏粘附性.

研究的目的:

  • 调查P3HB立体微观结构和粘附特性之间的关系.
  • 设计P3HB具有增强的粘合能力.
  • 开发一种可生物降解的替代商业粘合剂.

主要方法:

  • P3HB立体微结构的化学催化工程.
  • 在各种基板 (,钢,玻璃,木材) 上进行粘附测试.
  • 对热力学和粘性弹性性能进行评估.

主要成果:

  • 富含syndio的P3HB表现出高粘合强度,超过商业粘合剂.
  • 立体特异的P3HB变体 (同位体,同位体,同位体丰富) 显示没有可测量的粘附性.
  • 粘附性能不受摩尔质量,再加工或重复使用的影响.

结论:

  • P3HB微结构的化学催化工程是实现强粘合的关键.
  • 富含syndio的P3HB是一种高性能可生物降解的粘合剂.
  • 这项研究为粘合剂应用提供了可持续的解决方案.