Improvement of oxygen permselectivity of a rigid helical polyphenylacetylene: Effect of flexible groups, degree of polymerization, composites, thickness, orientation, and network formation

POLYMER

卷:228

Article

Shi, Jia¹  Kimura, Yuka¹  Takeda, Shohei¹  Xu, Chenxi¹  Shoji, Kazuki¹  Teraguchi, Masahiro¹  Kaneko, Takashi¹  Aoki, Toshiki¹ 

[1] Niigata Univ, Grad Sch Sci & Technol, Dept Chem & Chem Engn, Nishi ku, Ikarashi 2-8050, Niigata 9502181, Japan

关键词: Oxygen permselectivity;    Helical polyphenylacetylene;    Length of alkenyl groups;    Degree of polymerization;    Composites;    Thickness;    Orientation;    Network polymer;    Membrane reaction;    Polymer reaction;   

DOI  :  10.1016/j.polymer.2021.123900

来源: Elsevier

【 摘 要 】

In order to improve oxygen permselectivity of a rigid helical poly(alkenylphenylacetylene) membrane having a columnar liquid crystalline structure, several chemical and membrane structures including the degree of polymerization and the orientation of the macromolecules were modified and controlled. Introduction of longer alkenyl or flexible siloxane groups significantly enhanced oxygen permeability (PO2) and by reducing the degree of polymerization and the thickness of the membranes, or by the formation of network structures oxygen permselectivity (alpha = PO2/PN2) was effectively enhanced. The membranes from polymers with very small degree of polymerization and perpendicular orientation had extremely high alpha. In spite of the membranes from the polymers having the identical chemical structure, their performances could be optimized by controlling several membrane structures.

【 授权许可】

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