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相关概念视频

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.
Many natural and synthetic polymers are produced by...
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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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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序列控制的多聚氨酸刷的pH响应.

Xin Yuan1, Harold W Hatch2, Jacinta C Conrad1

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA. jcconrad@uh.edu.

Soft matter
|May 31, 2023
PubMed
概括
此摘要是机器生成的。

序列控制的聚烯酸刷 (PAB) 呈现出独特的pH反应. 单体序列,而不是移植密度,决定了PAB的行为,使可调节的刺激响应表面成为可能.

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科学领域:

  • 聚合物科学 聚合物科学
  • 表面化学 表面化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 多电解质刷 (PEBs) 呈现出明确的pH反应.
  • 在溶液中的多氨基酸 (PA) 显示了依赖序列的行为.
  • 响应刺激的材料对于先进的应用至关重要.

研究的目的:

  • 调查顺序控制的多粉质刷 (PAB) 的pH反应.
  • 将PAB行为与传统的PEB进行比较.
  • 确定单体序列和接种密度对PAB特性的影响.

主要方法:

  • PABs的分子模拟.
  • 对电离状态,高度,侧面结构和链形状的分析.
  • 不同的pH值,移植密度和单体序列.

主要成果:

  • 与PEB相比,PAB显示质量上不同的pH响应.
  • 接种密度对PAB属性有适度的影响.
  • 单体序列强烈影响pH响应,较大的块大小增加了响应范围,这是由于链内部的吸引力和背折叠.

结论:

  • 单体序列是调整PAB pH响应的关键因素.
  • 序列控制的PAB提供了一种创建可调节的刺激响应表面的方法.
  • 这些发现与基于溶液的多类植物的行为一致.