Carbon dioxide transport properties of composite membranes of a polyetherimide and a liquid crystal polymer

摘要

The effect of the addition of a liquid crystal polymer (Rodrun) on the gas sorption and transport properties of a polyetherimide (PEI, Ultem 1000) was investigated. CO2 permeation and sorption measurements were made with films of PEI, Rodrun and heterogeneous PEI/Rodrun blends at different pressures and temperatures. In all cases, permeability, diffusion and sorption coefficients decreased when the amount of Rodrun increased. A good agreement was found when permeability data obtained using both a permeability cell and a Cahn electrobalance were compared. Permeabilities of the binary composite material were calculated on the basis of those of the pure components and some theoretical assumptions concerning blend morphology. Results were consistent with a Rodrun structure in the composite intermediate between a fibrillar and a laminar morphology, as electron microscopy evidenced experimentally, (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 44]