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Modification of PDMS by Swelling Method and Its Application in Multilayer Composite Membranes

Authors： GAO Jifa, ZHAO Dan, SUN Jian, CHEN Shuhui, REN Jizhong, MA Junling

Units： 1 School of Environment and Chemical Engineering, Dalian Jiaotong University, Dalian 116028,China； 2. National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023,China

KeyWords： composite membranes；PDMS；swelling；nonionic surfactant；gas separation

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2023,43(3):44-53

Abstract：

Composite membranes which are an important development direction of membranes for gas separation, have been widely used in recent years. PDMS can effectively prevent pore penetration when it is used as the gutter layer of composite membranes. However, the hydrophobicity of PDMS is not conducive to the coating of the selective layer solution. Therefore, PDMS is urgently needed to be modified. In this paper, four nonionic surfactants- Pluronic®F68, Pluronic®F127, Tween20, and Tween60 were used to improve the hydrophilicity and gas separation performance of PDMS by swelling. As the results show, the PAN/PDMS composition membrane modified by Pluronic®F127 showed the best performance among the four nonionic surfactants. After swelling treatment, PAN/PDMS-Pluronic®F127 composition membrane had changed the surface composition and its hydrophilicity was enhanced. Compared with PAN/PDMS, the gas permeation performance of PAN/PDMS-Pluronic®F127 was greatly improved with little change on the mechanical and thermodynamic properties. The N2, O2, and CO2 permeance of PAN/PDMS-Pluronic®F127 composite membrane reached 419.8 GPU, 831.9 GPU, and 2879.7 GPU, respectively, and compared with PAN/PDMS, there was almost an increment of 70% while the selectivity remained mostly unchanged. Compared with PAN/PDMS, Pebax30R51 was more likely to form a defect-free thin selective layer on PAN/PDMS-Pluronic®F127. When swelling treatment was conducted, the CO2/N2 selectivity was improved from 22.27 of PAN/PDMS/Pebax30R51 to 45.09 of PAN/PDMS-Pluronic®F127/Pebax30R51 composite membrane which was the intrinsic selectivity of Pebax30R51 for CO2/N2 separation. Meanwhile, PAN/PDMS-Pluronic ®F127/Pebax30R51 showed CO2 permeance of 272.5 GPU.

Funds：

中国科学院战略性先导科技专项（XDC10020203），中国科学院稳定支持基础研究领域青年团队计划（YSBR-017）

AuthorIntro：

高继发（1999-），男，山东泰安人，硕士生，从事气体分离膜研究，E-mail：gaojf@dicp.ac.cn

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