Abstract
AbstractSorption and dilation isotherms and diffusion coefficients for seven hydrocarbons (n‐butane, isobutane, 1‐butene, cis‐2‐butene, trans‐2‐butene, isobutylene, and 1,3‐butadiene) in two rubbery polymers, 1,2‐polybutadiene (PB) and poly(ethylene‐co‐vinyl acetate) (EVAc), were measured at 25°C. Dissolution parameters (Henry's law coefficient and Flory‐Huggins interaction parameter), partial molar volumes, and diffusion coefficients were determined. PB exhibited greater affinity and lower diffusivity than EVAc to the C4 gases, although the gases showed nearly the same partial molar volumes in the two polymers. The diffusivity of such elongated molecules as trans‐2‐butene in both polymers was higher than that of bulky molecules with similar partial molar volume, such as cis‐2‐butene and isobutylene. Pressure‐dependent permeabilities of PB and EVAc films to the hydrocarbons were predicted and discussed based on the dissolution parameters and the diffusivities. © 1995 John Wiley & Sons, Inc.
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