聚酰亚胺
分子筛
渗透
碳化
材料科学
气体分离
化学工程
膜
高分子化学
选择性
复合材料
化学
有机化学
催化作用
吸附
扫描电子显微镜
图层(电子)
工程类
生物化学
作者
Chun-Po Hu,Clarisse K. Polintan,Lemmuel L. Tayo,Shang‐Chih Chou,Hui-An Tsai,Wei‐Song Hung,Kueir‐Rarn Lee,Juin‐Yih Lai
出处
期刊:Carbon
[Elsevier]
日期:2019-03-01
卷期号:143: 343-351
被引量:46
标识
DOI:10.1016/j.carbon.2018.11.037
摘要
Carbon molecular sieve membranes (CMSMs) are regarded as promising membranes for gas separation due to its high gas separation performance. Polyimide (ODPA-FDA) precursor films were prepared and characterized for the formation of carbon molecular sieve membranes. This was compared to a commercial polyimide Matrimid. The precursor membranes were characterized with dynamic mechanical analysis, thermogravimetric analysis, X-ray diffraction, FTIR spectroscopy, positron annihilation lifetime spectroscopy in order to determine the effect of the polyimide structure on its permeation properties. The carbonized membranes were characterized by determining its pore size distribution and sorption isotherms. Results showed that ODPA-FDA polyimide has a higher Tg and d-spacing than that of Matrimid. The permeability and selectivity of ODPA-FDA precursor and carbonized films were higher or similar than that of Matrimid precursor and carbonized films due to the addition of a bulky aromatic group in the ODPA-FDA amine moiety which causes narrow free volume distribution. The unique structure of ODPA-FDA polyimide makes it an attractive candidate for the precursor of CMSM.
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