Relationships between the chemical structures and the solubility, diffusivity, and permselectivity of propylene and propane in 6FDA‐based polyimides
作者： Akira Shimazu , Tsukasa Miyazaki , Masatoshi Maeda , Kenichi Ikeda
DOI: 10.1002/1099-0488(20001001)38:19<2525::AID-POLB40>3.0.CO;2-2
关键词: Diamine 、 Propene 、 Solubility 、 Propane 、 Permeation 、 Semipermeable membrane 、 Polymer chemistry 、 Chemistry 、 Chemical engineering 、 Polyimide 、 Phenylene
摘要: The solubility, diffusivity, and permselectivity of propylene propane in 40 different polyimides synthesized from 2,2-bis(3,4-decarboxyphenyl)hexafluoropropane dianhydride (6FDA) were determined at 298 K. influence the chemical structures on physical gas permeation properties 6FDA-based was studied. solubility an unrelaxed volume a polymer matrix mainly contributes to total for various polyimides. permeability propylene, propylene/propane mixed-gas system depend propylene. This is thought be associated with penetrant-induced plasticization effect. polyimides, which have high glass-transition temperature large fractional free volume, exhibit relatively low permselectivity. Changing number of-CH3 substituents phenylene linkage changing connectivity main chain are good ways controlling corresponding system. Some restrict through introduction -CONH- between linkage; -Cl substituent diamine moiety exhibits separation performance potentially useful membrane materials petrochemical industry.
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