Abstract
AbstractThe solubility and diffusivity of several gases in polystyrene (PS) and styrene acrylonitrile copolymer (SAN) were studied with the pressure decay method. Data were collected for carbon dioxide, isobutane, and 1,1,1,2‐tetrafluoroethane (R‐134a) in PS and for R‐134a in SAN. The temperature range was between 30 and 200°C, and the gas pressures ranged from approximately 0.2 to 8.2 MPa. To cover these ranges, both the absolute and differential pressure decay methods were required. Henry's law was found to adequately represent all the gas solubilities. Isobutane and R‐134a were found to have a plasticizing effect on PS and SAN; that is, the diffusivity increased significantly as the pressure (and mass uptake) increased. CO2 in PS had the highest diffusivity and lowest solubility and did not affect the diffusivity in PS over the pressure range studied. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
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