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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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聚电解质复合物的溶剂反应性玻璃过渡行为.

Hongwei Li1, Dmitry Tolmachev2,3, Piotr Batys4

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States.

Macromolecules
|January 20, 2025
PubMed
概括

聚电解质复合物 (PEC) 在与酒精溶解时表现出改变的玻璃过渡. 基数量和溶剂大小影响玻璃化过渡温度 (Tg),提供预测指南.

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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

背景情况:

  • 聚电解质复合物 (PEC) 是具有可调节性质的先进材料.
  • 了解它们的热行为,特别是玻璃过渡,对于材料设计至关重要.

研究的目的:

  • 研究酒精溶解对聚二甲基/聚烯酸 (PDADMA/PAA) 复合物的玻璃化过渡温度 (Tg) 的影响.
  • 建立溶剂特性和PEC玻璃过渡之间的预测关系.

主要方法:

  • 调制差分扫描热度计 (MDSC) 用于测量玻璃过渡.
  • 全原子分子动力学 (MD) 模拟来分析溶剂-PAA相互作用.
  • 具有不同基团号的酒精溶剂的系统变化.

主要成果:

  • 酒精溶剂,除糖醇外,在PDADMA/PAA PEC中诱导了塑化和可检测的玻璃过渡.
  • 在1/Tg和基基与内在离子对的比率之间发现了线性相关性.
  • 模拟MD证实,溶剂大小和基决定结并影响Tg.

结论:

  • 酒精溶剂的化学结构显著影响PECs的玻璃过渡行为.
  • 基于溶剂基含量提出了PEC-溶剂相互作用的预测模型.
  • 这项研究为设计基于PEC的智能材料提供了指导方针,这些材料具有量身定制的热性能.