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相关概念视频

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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作为设计策略的脱聚合:聚合诱导的微相分离的脱聚合蚀刻.

Kaden C Stevens1, Megan E Lott1, Kiana A Treaster1

  • 1George and Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.

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概括
此摘要是机器生成的。

热去聚合是一种新的策略,可以在没有溶剂的情况下制造多孔的纳米结构聚合物材料. 这种方法,即聚合诱导微相分离的脱聚合蚀刻 (DEPIMS),可实现可扩展的功能材料制造.

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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:

  • 热触发的脱聚合通常与回收和可持续性有关.
  • 在聚合物中创建多孔性的传统方法通常面临由于使用溶剂而面临的质量运输限制.

研究的目的:

  • 证明选择性热解聚化可以成为设计纳米结构聚合物材料的建设性工具.
  • 开发一种无溶剂的策略,在聚合物中产生多孔性,绕过基于溶液的方法的局限性.

主要方法:

  • 利用聚合诱导微相分离 (PIMS) 来创建具有可脱聚合域的块共聚合物结构.
  • 开发了一种称为聚合诱导微相分离的脱聚合蚀刻 (DEPIMS) 的工艺,该工艺使用一个耐热的烯基基质矩阵内的热敏感的甲基烯酸块.
  • 通过回归到气态单体实现了选择性域去除.

主要成果:

  • 使用DEPIMS方法生成具有高表面积 (>200 m2/g) 的中孔聚合物材料.
  • 创建了具有可调节的吸收动力学和高染料吸附能力的功能性半孔吸附剂.
  • 证明了一种可扩展的,单的DEPIMS方法,在12小时内产生半孔材料和可回收的单体.

结论:

  • 重定位热脱聚合作为材料设计的广泛启用策略,而不仅仅是可持续性.
  • 突出了DEPIMS作为可扩展,按需制造功能纳米结构材料的多功能平台.
  • 展示了为化学分离创造先进吸附剂的潜力.