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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Step-Growth Polymerization: Overview01:03

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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.
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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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一个聚合物脊柱编辑策略,用于增强属性.

Wen Cai1, Wenbing Wang1, Fuzhou Wang2

  • 1Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.

Journal of the American Chemical Society
|February 27, 2026
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概括
此摘要是机器生成的。

聚合物骨干编辑 (PBE) 在合成后修改聚合物结构. 这项研究增强了聚乙烯 (PNB) 的性能,通过PBE提高了耐热性和机械强度.

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 有机合成 有机合成

背景情况:

  • 聚合物的特性取决于微观结构,特别是骨干架构.
  • 聚合后修饰,或聚合物骨干编辑 (PBE),提供了一条改变聚合物结构的途径.
  • 对于提高材料性能的PBE的应用仍未得到充分探索.

研究的目的:

  • 调查PBE策略的有效性,以提高聚乙烯 (PNB) 的材料特性.
  • 通过PBE修改PNB的骨干架构,以改善其热和机械特性.

主要方法:

  • 一个两步的PBE策略,涉及PNB的环氧化和随后的环膨胀环氧化PNB (EPNB).
  • 实验调查和密度函数理论 (DFT) 计算以阐明环膨胀机制.
  • 改性聚合物的热和机械性能,包括玻璃过渡温度 (Tg) 的描述.

主要成果:

  • 该PBE策略非常有效和有选择性,避免了聚合物降解或交叉链接.
  • 环膨胀反应由易斯酸催化,形成了一个刚性的主链架构与桥梁环单元.
  • 经过修改的聚合物显著提高了耐热性 (Tg = 233 °C) 和机械性能.
  • 引入极性含氧组增强了水友性和对无机基质的附着性.

结论:

  • 开发的PBE策略有效地提高了聚合物在初始形成后的材料特性.
  • 这种方法提供了一种通过修改骨干架构来定制聚合物性能的多功能方法.
  • 增强的热稳定性,机械强度和表面性能使PBE修饰的聚合物适用于先进的应用.