Abstract
The influence of pressure conditioning on the gas transport properties of various imidized polyamic acid [PAA] films was investigated. The variation of sorption and permeation caused by CO2 pressure conditioning was interpreted using dual-mode sorption and partial immobilization models. The sorption amount of CO2 at 25°C of unimidized PAA film increased markedly by pressure conditioning above 30 atm of CO2. It was found that unimidized PAA film was plasticized at 25°C at a pressure above 30 atm of CO2 and the film cooled relatively quickly to liquid N2 temperature and possibly contain a frozen microvoid or free volume between polymer segments. The sorption amount of CO2 of imidized PAA films also increased by pressure conditioning at 60 atm of CO2. This can be attributed to increase of unrelaxed volume due to pressure conditioning as shown by increase of Langmuir sorption capacity CH′. The increase in CH′ of pressure conditioned films with low imide content was larger than that with high content. The diffusion coefficients of Henry and Langmuir modes of CO2 for imidized PAA film, DD and DH, also increased by pressure conditoning. The increase of DH of each imidized PAA film was more marked than that of DD.
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Hachisuka, H., Tsujita, Y., Takizawa, A. et al. Influence of Pressure Conditioning on the Gas Transport Properties of Imidized Polyamic Acid Films. Polym J 21, 1019–1025 (1989). https://doi.org/10.1295/polymj.21.1019
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DOI: https://doi.org/10.1295/polymj.21.1019