GAS SORPTION IN SUBSTITUTED POLYACETYLENES

Sorption of several gases (He, N-2, Ar, CH4, CO2, C2H6) was measured i n an extended pressure range (up to 100 at m) in two glassy polyacetyl enes: poly[1-phenyl-2-(p-tert-butylphenyl)acetylene] and samples of po ly[1-(trimethylsilyl)-1-propyne] (PTMSP), which were partly oxidized d uring long term storage in the ambient atmosphere. Sorption isotherms are concave to the pressure axis and can be described by the dual mode sorption model. Both polyacetylenes are distinguished by relatively l arge Langmuir sorption capacity parameters C-H'. However, the C-H' val ues and solubility coefficients are significantly lower than these of fresh PTMSP.