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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

3.1K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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

Cationic Chain-Growth Polymerization: Mechanism

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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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通过序列控制的多元组件自组装自排序,随机和块超分子共聚物

Aritra Sarkar1, Ranjan Sasmal1, Charly Empereur-Mot2

  • 1New Chemistry Unit and School of Advanced Materials (SAMAt), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560064, India.

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概括

这项研究证明了复杂纳米结构的序列控制超分子共聚化. 通过操纵热力学和动力学路径, 研究人员精确地控制共聚物序列, 克服预测挑战.

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科学领域:

  • 超分子化学
  • 聚合物科学
  • 纳米技术

背景情况:

  • 多组件超分子共聚使复杂的纳米结构构建成为可能.
  • 由于各种可能的结果 (同聚物,随机,替代,块) 预测共聚物结构具有挑战性.
  • 控制分子间相互作用和单体交换动态是关键.

研究的目的:

  • 为了实现前所未有的双元序列控制的超分子共聚化.
  • 解决超分子自我组装中的结构预测挑战.
  • 操纵热力学和动力学路径以实现精确的序列控制.

主要方法:

  • 使用分子动力学模拟来了解单体交换率和相互作用的自由能量.
  • 调查自我组装路径和序列的确定.
  • 使用结构化照明显微镜 (SIM) 进行表征.

主要成果:

  • 证明了前所未有的双组分序列控制的超分子共聚变.
  • 通过模拟获得了自我组装路径和序列控制的机械洞察力.
  • 通过SIM成功描述了三个不同的序列.

结论:

  • 通过操纵热力学和动力学因素,可以精确控制高分子共聚物序列.
  • 分子动力学模拟是了解自我组装机制的有价值的工具.
  • 这项工作推进了具有可预测的新兴性质的复杂纳米结构的构建.