Preparation and Properties of Gas-Separation Membranes Based on Blends of Poly(ether-co-amide)

doi:10.19491/j.issn.1001-9278.2019.09.003

Abstract

Abstract: Polymer blending can produce the blend membranes with different properties from different polymers. In order to improve the comprehensive performance of gas separation membranes, two different types of poly(ether-co-amide), Pebax 1657 with high selectivity and Pebax 2533 with high permeability, were used as membrane materials to prepare gas-separation membranes by a blending method, and the structure, separation performance and mechanical properties of the resulting separation membranes were investigated. The results indicated that the chain spacing of polyamide segments, free volume fraction and elongation at break increased with an increase of the content of Pebax 2533, and however the glass transition temperature decreased. Compared to pristine Pebax 1657 membrane, the blend membranes exhibited an increase in permeability coefficients of CO2 and N2 and a gradual decrease in selectivity. The permeability coefficient of N2 was found to increase faster than that of CO2. Compared to pure Pebax-type membranes, the blended membranes presented an improvement in comprehensive properties.

Key words: poly ethercoamide; blend, carbon dioxide capture; membrane separation, Pebax

CLC Number:

TQ051.893

ZHAO Qing, HE Shaojian, LIN Jun, LIN Qianguo. Preparation and Properties of Gas-Separation Membranes Based on Blends of Poly(ether-co-amide)[J]. China Plastics, 2019, 33(9): 13-20.

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