... rapid decrease of free volume and permeability over time (Witchey-Lakshmanan et al., 1990; Pinnau et al., 1997; Nagai and Nakagawa, 1995; Takada et al., 1980; Hamano et al., 1988; Asakawa et al., ... et al., 1990; Pinnau et al., 1997; Nagai and Nakagawa, 1995; Takada et al., 1980; Hamano et al., 1988; Asakawa et al., 1989; Yampol’skii et al., 199 3a; Dorkenoo and Pfromm, 2000; Tasaka et al., ... discussion of an accelerated CO2 Plasticization observation of ultra -thin polyimide films and the effect of surface chemical cross-linking on plasticization and physical aging Chapter summarizes...