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相关概念视频

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.
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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具有内置目标属性的生物支持平台访问聚胺

Prerana Carter1,2, James L Trettin1, Ting-Han Lee1

  • 1Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States.

Journal of the American Chemical Society
|May 6, 2022
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概括

研究人员从生物质中提取的酸中开发了新型单体,以制造先进的聚胺. 这些新材料具有增强的疏水性和阻燃性, 为石油塑料提供可持续的替代品.

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科学领域:

  • 聚合物化学和材料科学
  • 可持续化学和生物提炼

背景情况:

  • 基于石油的平台化学物质对工业至关重要.
  • 未来的生物炼油厂需要从生物质中获得具有增强性能的新分子.
  • 像尼龙-6,6这样的聚胺被广泛使用,但有其局限性.

研究的目的:

  • 探索一种新的方法来合成生物质中的单体.
  • 创建性能优化的聚胺与内置的疏水性和阻燃性.
  • 展示迪尔斯-阿尔德化学在生物质利用方面的潜力.

主要方法:

  • 通过Diels-Alder循环添加从粘液酸合成装饰的循环二酸.
  • 新型单体与六甲基二胺和酸的共聚.
  • 由此产生的聚胺的特征包括吸水性和阻燃性.

主要成果:

  • 成功合成新型循环二酸单体与和芳香装饰.
  • 与尼龙-6-6相比,生产的聚胺的吸水量减少了70%.
  • 观察到煤炭产量增加了一倍,
  • 保持了原始尼龙-6,6聚合物的关键特性.

结论:

  • 开发的方法可以创建具有显著改善的疏水性和阻燃性的聚胺.
  • 这种方法提供了从可再生生物质资源中获得高性能聚合物的可持续途径.
  • 该策略可用于获取各种性能优化的聚胺.