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Fluorotriphenylenediamine structure reinforced polyimide gas permeability

Authors： WANG Hanli1,2, RUAN Xuehua1, DAI YAN1, HE Gaohong1, SHAN Timei2, WANG LEI1,2, MENG Xiangqing2, XU Guofeng2

Units： 1.State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Liaoning Province Engineering Laboratory for Petrochemical Separation Technologies, School of Petroleum &Chemical Engineering, Dalian University of Technology, Panjin 124221, China; 2. Shandong Huaxia Shenzhou New Material Co. Ltd., State Key Laboratory of Fluorine Containing Functional Membrane of Dongyue Group, Zibo 255000, China

KeyWords： structural design; fluorine-containing polyimide; gas permeability; molecular simulation

ClassificationCode：TQ028.3

year,volume(issue):pagination： 2018,38(6):34-40

Abstract：

The incorporation of stereo side groups in the glassy polymer is an effective method to reduce the accumulation of the main chain, increase the free volume, and increase the gas permeability of the polymer. In this paper, the hexafluorotriphenylenediamine(BABTFMM) with tri-dimensional structure was polycondensed with hexafluoro dianhydride (6FDA) to prepare polyimides with high gas permeabilities, and using Grand Canonical Monte Carlo and molecular dynamics methods to predict its gas permeation separation performance. Homogeneous membranes were prepared for experimental test. The results of molecular simulations show that the hexafluoroxylene side groups in the diamine monomer is useful to increase the main chain spacing of the polyimide, reduce the packing density, and increase the free volume by the effect of steric hindrance and main chain configuration restriction, as a result, the gas permeability of 6FDA-BABTFMM polyimides is improved. Homogenous films of 6FDA-BABTFMM and 6FDA-ODA fluorine-containing polyimide were prepared for gas permeability test. The gas permeation performance test results are consistent with those of the molecular simulation. The permeability of 6FDA-BABTFMM is significantly higher than that of 6FDA-ODA polyimide, and the permeation rates of oxygen, nitrogen, methane, and carbon dioxide are 75.2, 20.5, 17.2, 311.3 bar, respectively.

Funds：

国家自然科学基金青年基金（21606035, 21706023）；中国博士后科学基金资助项目（2018M631167）

AuthorIntro：

第一作者简介：王汉利（1974-），男，山东滨州博兴人，博士研究生，高级工程师，主要研究方向为含氟膜材料制备及气体膜分离，Email：whl7327@126.com；　通讯作者，Email：hgaohong@dlut.edu.cn

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