膜科学与技术

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Effect of preoxidation on the morphology and performance of polyacrylonitrile membrane

Authors： DING Linghua1, JIN Xin1, LI Lin1, LI Kuiran2, WANG Tonghua1*

Units： 1 State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science, School of Chemical Engineering, Dalian University of Technology, Dalian 116024.

KeyWords： polyacrylonitrile；preoxidation；asymmetric membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(2):1-6

Abstract：

The asymmetric membranes were prepared by dry-wet phase inversion method, in which polyacrylonitrile (PAN) was used as the precursor, N-methylpyrrolidone as the solvent and water as the coagulant. The change of chemical and microstructure during the air preoxidation and effect of preoxidation conditions on the structure and gas separation performance of obtained PAN membranes were investigated via FT-IR, XRD, SEM and constant pressure variable volume method. Results indicate that the chemical structure of PAN membrane is transformed from linear structure into three-dimensional structure due to oxidative crosslinking reaction during the preoxidation process which makes PAN membranes turn into thermosetting materials from thermoplastic ones. Peoxidation process also greatly influences the gas separation performance of PAN membranes. Increasing the preoxidation temperature, holding time and air flow rate are all beneficial to improve the performance. However, the excessive preoxidation makes the performance decrease. SEM shows that the preoxidation membrane has the basic pore morphology of polymer membrane.

Funds：

国家自然科学基金(21176036,21276035)、国家863项目(2012AA03A611)

AuthorIntro：

丁玲华(1989-)，女，湖北应城，硕士生，从事炭膜材料的研究

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