Vapor Transport in Silica-Based Hybrid and Mixed Matrix Glassy Membranes (original) (raw)

Abstract

Nanocomposite materials obtained combining inorganic fillers with high free volume glassy polymers have been investigated in the last decade with the aim to improve the permselectivity of polymeric membranes for gas and vapor separation. The glassy matrix chosen for the present study is poly[1-(trimethylsilyl)-1-propyne] (PTMSP), for which relatively large information about the gas and vapour transport and the microscopic morphology is available in the literature. The object of this study is an experimental analysis of n-pentane sorption and diffusion into: i) mixed matrices formed by PTMSP and hydrophobic nanometric silica added in solution (mass fractions ranging from 10 to 50wt %); ii) hybrid matrices formed by PTMSP and Si-SiO2 obtained from tetraethoxysilane (TEOS) via sol-gel reaction, with silica content ranging from 10 to 30%. The first aim of the study is to compare the transport behaviour of the two types of matrices at similar silica content and to understand the role of ...

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