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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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超快速的界面自组装向生物衍生聚COF膜与微观结构优化.

Jingcheng Du1, Ayan Yao1, Qian Sun1

  • 1CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.

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概括

研究人员使用植物衍生物单体开发了新的共价有机框架 (COF) 膜. 一个优化的电场系统显著增强了膜形成,导致了优越的分离性能.

关键词:
结的共价有机框架膜.接口微环境控制控制分子选 分子选可以编程的MWCOCO.调节反应动力学的调节.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 纳米技术 纳米技术

背景情况:

  • 精确控制膜微结构 (孔径大小,自由体积,连接性),厚度和机械性能对于独立的膜应用至关重要.
  • 共价有机框架 (COF) 为先进的分离技术提供可调节的特性.

研究的目的:

  • 通过使用植物衍生的类单体 (酸和氨酸) 合成新的以结合的COF膜.
  • 通过接口电场系统优化COF膜微结构.
  • 评估用于分离应用的开发的COF膜的性能.

主要方法:

  • 使用埃拉基酸,奎尔塞丁和铁甲化物合成与结合的COF膜.
  • 使用三个接口电场系统优化膜微结构:电中性,正电和负电.
  • 分析表面活性剂基链长度与膜性质 (毛孔大小,分子量切割值) 之间的相关性.

主要成果:

  • 带正电荷的电场系统加速了膜的形成,产生了带有均孔的更密集的膜,并提高了灵活性.
  • 表面活性剂基链长度的增加导致了更均的孔径和更小的分子重量切断.
  • 优化的COF膜表现出高透率,优良的选能力以及强大的机械和化学稳定性.

结论:

  • 通过使用电场系统,成功合成了新的植物衍生COF膜,并优化了它们的微观结构.
  • 开发的COF膜表现出了先进的基于膜的分离科学和技术的有希望的特性组合.
  • 这项工作突出了生物基单体和电场操纵在制造高性能分离膜方面的潜力.