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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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在微相分离区块共聚合物电解质中的封闭效应 - 导电性和结晶性

Michael Patrick Blatt1,2, Stephanie Posedel1,2, Kyoungmin Kim1,2

  • 1Department of Chemical and Biomedical Engineering, Florida A&M University-Florida State University (FAMU-FSU) College of Engineering, Tallahassee, FL 32310, USA. dhallinan@eng.famu.fsu.edu.

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聚合物电解质中的离子导电性取决于形态学. 曲线形态增强导电性,而状形态降低导电性,为固态电池设计提供了洞察力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 电化学 电化学 电化学

背景情况:

  • 聚乙烯 (PS) 和聚乙烯氧化物 (PEO) 的块共聚合物 (BCP) 对于聚合物电解质至关重要.
  • 了解形态对离子运输的影响,是先进电池技术的关键.

研究的目的:

  • 为了研究囚禁和形态学对PS-PEO块共聚合物电解质的离子导电性的影响.
  • 探索用于设计高性能固态电池电解质的结构-属性关系.

主要方法:

  • 合成和表征了具有球形,圆柱形和片状形态的PS-PEO块共聚物.
  • 通过加入二三甲硫胺 (LiTFSI) 盐来制备的块共聚合物电解质.
  • 使用X射线散射测量了域间距,并定义了限制长度.

主要成果:

  • 限制指数地阻碍了PEO结晶 (15nm的指数常数).
  • 离子导电性随着被限制在叶片形态中而降低.
  • 曲线形态 (球体,圆柱体) 随着限制的增加,增强导电性.

结论:

  • 形态依赖的限制显著影响PS-PEO电解质中的离子导电性.
  • 曲线形态为固态电池增强离子运输提供了一个有希望的途径.
  • 这些发现指导了先进聚合物电解质的合理设计.