Peculiarities of Butane Transfer in Poly(4-Methyl-1-Pentene)

The features of the butane transfer through homogeneous membranes 40–50 μm thick based on poly(4-methyl-1-pentene) (PMP) of various crystallinity degrees have been investigated in the temperature range from 10 to 80°C. It has been shown that in this temperature range, including T g of the polymer, for continuous PMP membranes obtained by the melt technology there is a significant influence of butane activity, which was previously described in the literature for composite membranes based on PMP with thin selective layers formed from solutions. It has been noted that the degree of crystallinity of PMP has a significant effect on the permeability. Based on the experimental data, the temperature parameters have been calculated taking into account the exponential form of the dependence of permeability on the butane activity. Temperature dependences have been obtained in the absence of the influence of butane on the polymer, which have a nearly linear form in the Arrhenius coordinates, while practically coinciding for samples with different degrees of crystallinity.