Nitrogen permeability and carbon dioxide solubility in poly(1- trimethylsilyl-1-propyne)-based binary substituted polyacetylene blends

Abstract

The nitrogen permeability and carbon dioxide solubility in poly(1-trimethylsilyl-1-propyne) (PTMSP)/poly(4-methyl-2-pentyne) (PMP) blends were studied and compared with previously reported values for PTMSP/poly(tert-butylacetylene) (PTBA) and PTMSP/poly(1-phenyl-1-propyne) (PPP) blends. The nitrogen permeability of the homopolymers follows the order: PTMSP > PMP > PTBA > PPP. This order is the same as that of their fractional free volumes, that is, the permeability of the polymers decreases with decreasing fractional free volume. The permeability of the blends obeys a simple mixing rule for homogeneous binary polymer blends. As expected, the nitrogen permeability of PTMSP/PMP blends decrease..