Partially pyrolyzed membranes (PPMs) derived from copolyimides having carboxylic acid groups. Preparation and gas transport properties
作者： E.M. Maya , A. Tena , J. de Abajo , J.G. de la Campa , A.E. Lozano
DOI: 10.1016/J.MEMSCI.2009.12.001
关键词:
摘要: Abstract A series of partially pyrolyzed membranes ( PPMs ) were prepared from a copolyimide having carboxylic acid pendant groups PIA ). The effect the final pyrolysis temperature (425, 450 and 475 °C) on gas separation properties was investigated compared with those . thermal treatments caused progressive removal simultaneous increase fractional free volume Thus, it found that permeability coefficients higher than , between 6.5 25 times higher, depending tested temperature, while selectivity slightly decreased. All attractive materials to separate CO 2 CH 4 since inside commercially interesting region are close present Robeson trade-off limit line. at 475 °C yielded PPM best performance: /CH 47 95 barrers.
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