Abstract
The sorption and transport of acetone in a glassy liquid crystalline random copolyester, composed of 40 mole percent p-hydroxybenzoic acid and 30 mole percent each of p-hydroquinone and isophthalic acid (HIQ-40), were characterized as a function of thermal treatment temperature. The solubility and diffusivity of acetone in solvent-cast amorphous HIQ-40 films are similar to the solubility and diffusivity of acetone observed in common amorphous, glassy barrier polymers. Controlled thermal annealing resulted in the systematic reduction of both the solubility and acetone diffusion coefficient by approximately an order of magnitude. These effects result, presumably, from the systematic development of nematic liquid crystalline order and a small amount of conventional three-dimensional crystallinity with controlled annealing. These results suggest that liquid crystalline order strongly precludes penetrant absorption and subsequent transport in HIQ-40, with penetrant solubility and transport limited to less ordered defect regions between liquid crystalline domains.
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