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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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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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酒精可加工的全聚合物n型热电器

Xinyi Fan1,2, Jian Liu1,2,3, Xiaozheng Duan1

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 22, 2024
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概括

这项研究引入了一种全聚合物n型热电材料,使用一种新型的合聚合物和聚乙胺 (PEI) 剂. 与传统的小分子剂相比,这种方法提高了功率因子和热稳定性.

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全聚合物n型热电制品导电材料的导电材料是指导材料.n-兴奋剂的使用.有机热电材料 有机热电材料聚合物多剂多剂的使用

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科学领域:

  • 有机电子学有机电子学
  • 热电材料是一种热电材料.
  • 聚合物科学 聚合物科学

背景情况:

  • N型有机热电器通常将合聚合物与小分子剂混合在一起.
  • 开发稳定高性能n型有机热电材料仍然是一个挑战.

研究的目的:

  • 报告一个全聚合物n型热电材料.
  • 为了提高n型有机热电装置的性能和稳定性.

主要方法:

  • 合成了一种可溶于酒精的n型结合聚合物与类 (乙烯基醇) (OEG) 侧链.
  • 通过使用聚乙烯胺 (PEI) 作为剂的旋转涂层创建的聚合物宿主/聚合物剂混合膜.
  • 研究了聚合物剂对电荷传输和材料形态学的影响.

主要成果:

  • 全聚合物混合物的功率系数为36.9μW m-1 K-1,是使用小分子剂的对照混合物的两倍.
  • 减少了库伦比克相互作用,并保留了聚合物宿主堆叠在混合膜中.
  • 与对照混合物相比,显著提高了热稳定性.

结论:

  • 全聚合物n型热电材料提供高性能和出色的稳定性.
  • 使用像PEI这样的聚合物剂是推动有机热电技术发展的一个有前途的战略.
  • 开发的配合聚合物与OEG侧链使溶液可加工性和高热电性能成为可能.