Sorption and Transport of Inert Gases in PVF2/PMMA Blends

摘要

Sorption and transport of several inert gases (He, Ar, N2, and CH4) in miscible blends of PMMA and PVF2 are reported as a function of pressure at 35C. For each gas, the permeabilities are independent of pressure for all blend compositions. Sorption isotherms are linear for rubbery compositions (PVF2-rich) and nonlinear for glassy compositions (PMMA-rich) as expected. In contrast to CO2, these gases do not plasticize any of these materials. The data are analyzed using appropriate models for sorption and transport, and the parameters are correlated in terms of blend composition and molecular characteristics of the gases. Effects of crystallinity are discussed. Sorption behavior is compared with poly(methyl acrylate) and poly(vinyl acetate).