Abstract
Abstract During an extensive study of gas and vapor transport in solventcast acrylonitrile homopolymer films, it was found that the film contained small amounts of tenaciously held solvent, normally dimethylformamide [1]. The amount remaining even after prolonged exposure in vacuum at 50°C was about 2. 5%. This could be reduced to less than 0. 25% by prolonged boiling in water and completely removed by alternate benzene and boiling water extractions. Removal of the 2–3% residual solvent was found to raise the glass transition temperature from 72 to 95°C and to lead to more brittle films.
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