Abstract
ABA-type triblock copolymers derived from 4,4'-(hexafluoroisopropylidene)diphthalicanhydride-2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TeMPD) and methacryl phenyl polyhedral oligomeric silsesquioxane (MPPOSS) were synthesized by atom transfer radical polymerization. The chemical structure of the synthesized ABA-type triblock copolymer was confirmed by 1H NMR, 13C NMR, 29Si NMR and Fourier transform infrared analyses. The ratios of 6FDA-TeMPD and MPPOSS determined by TGA were 94/6, 85/15, 77/23, 68/32, 57/43 and 31/69. The film density of the ABA-type triblock copolymer films did not conform to the mixing rule because of polyimide (PI) chain aggregation. Based on contact angle and water uptake analyses, the hydrophobicity of the ABA-type triblock copolymer film was determined to be higher than the theoretical value because of POSS cage effects and PI chain aggregation. The gas permeability coefficient of the ABA-type triblock copolymer decreased compared with that of PI because of aggregation of PI chains and inhibition of solubility decreases by substitutes with high affinity. ABA-type triblock copolymer CO2/H2 separation performance increased compared with that of PI. The ABA-type triblock copolymer derived from PI and MPPOSS can be described as a polymer material with higher hydrophobicity and higher CO2/H2 selectivity than PI. © 2015 Society of Chemical Industry
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