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

Abstract

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.

A novel poly (4-methyl-1-pentene)/polypropylene (PMP/PP) thin film composite (TFC) artificial lung membrane for enhanced gas transport and excellent hemo-compatibility

“…The porous PP support did not affect the permselectivity due to the good compatibility with PMP layer. The features of the gas transfer through homogeneous membranes 40–50 μm thick based on poly(4-methyl-1-pentene) (PMP) have been studied in the previous literature [ 20 , 40 , 41 ]. The gas selectivity (O 2 /N 2 ) of PMP homogeneous membrane is 3.1–4.7, which is similar to the gas selectivity (O 2 /N 2 ) of the composite membrane in this study, the integrity of the TFC membrane is further demonstrated.…”

“…Similarly, we use microporous PP membrane with pore size of ∼100 nm, porosity of 46% and thickness of 25 μm as the support layer due to the high permeability [ 18 , 19 ], to avoid the plasma leakage and assure the gas permselectivity, a thin and integrative PMP layer was coated on PP support to form the PMP/PP TFC membrane. In comparison to the sole PMP membrane with asymmetric structure [ 20 ], the support and selective layer of PMP/PP membrane can be regulated respectively, offering more controllability and low cost. This might be an alternative solution to state-of-the-art artificial lung membranes to achieve both high permeance, selectivity and stability.…”