Using Poly(4-methylpentene-1) (PMP) as a membrane material

and cyclohexane

trichlo-roethylene

tetrachloroethylene

and the mixture of cyclohexane and trichloroethylene as solvents

these solutions were cast to form homogeneous dense membranes

and the membrane permeation behavious for oxygen

nitrogen

hydrogen

and carbon dioxide were investigated. The results showed that gas permeation mainly occurs in amorphous region of the PMP

but also in the crystalline region. The gas permeation activation energy in VI-form crystal of the PMP was lower than that in I-form crystal.