Abstract
For (AB)n type multiblock copolymers of bisphenol A polycarbonate (PC) and polyoxyethylene (POE) with varying composition and block length, water sorption behavior was examined at 25°C. Copolymer samples with high PC content exhibited BET type IV isotherms and non-Fickian kinetics. Such behavior resembled that of PC homopolymers, presumably because the samples had a PC rich continuous phase. Copolymers with intermediate PC content showed sorption behavior varying with block length. Those with relatively long POE blocks exhibited BET type II isotherms and Fickian kinetics, and those with short blocks, BET type III isotherms but non-Fickian kinetics. Samples with low PC content exhibited BET type II isotherms and Fickian kinetics. This latter behavior was not found either in PC or POE homopolymers, and was specific to the POE rich multiblock copolymers, reflecting their microphase-separated structures and PC and POE intermixing phases.
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Suzuki, T., Chihara, H. & Kotaka, T. Sorption of Water by Bisphenol-A Polycarbonate and Polyoxyethylene Multiblock Copolymers with Varying Composition and Block Length. Polym J 16, 129–138 (1984). https://doi.org/10.1295/polymj.16.129
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DOI: https://doi.org/10.1295/polymj.16.129