巴勒
芴
溶解度
高分子化学
热稳定性
选择性
玻璃化转变
缩聚物
材料科学
聚酰胺
部分
溶剂
化学工程
有机化学
化学
聚合物
催化作用
工程类
作者
Tengyang Zhu,Xing Yang,Xiaoqi He,Yayun Zheng,Jujie Luo
标识
DOI:10.1177/0954008317732121
摘要
A series of new aromatic polyamides (PAs) and copolyamides (CPAs) containing fluorene group have been synthesized through polycondensation reaction. The chemical structure was confirmed by Fourier transform infrared and proton nuclear magnetic resonance ( 1 H NMR). PAs and CPAs exhibited the higher thermal stability ( T d15 > 378°C in nitrogen), the higher glass transition temperature ( T g > 345°C), and excellent solubility in polar solvent. Gas transport properties of the PA and CPA membranes were investigated using different single gases (hydrogen (H 2 ), carbon dioxide (CO 2 ), oxygen (O 2 ), methane (CH 4 ), and nitrogen (N 2 )). We discussed the effect of chemical structure and operating temperature on gas transport properties. The results show that PA-1 containing a hexafluoroisopropylidene moiety exhibited the highest gas permeability ( P H2 = 12.71 Barrer, P CO2 = 12.26 Barrer, and P O2 = 2.62 Barrer) and reasonably good selectivity ( α(H 2 /N 2 ) = 27.63, α(CO 2 /N 2 ) = 26.65, and α(O 2 /N 2 ) = 5.70) at 25°C and 1 atm. For all the membranes, gas permeability gradually increased with the increase in operating temperature, while the selectivity gradually decreased. These gas permeation results were well correlated with fractional free volume, interchain d-spacing ( d sp ), and intermolecular interaction.
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