Preparation of poly(vinylidene fluoride) based blend mixed matrix membrane comprising metal organic framework for gas separation application
Paper ID : 1164-MST2015-FULL
Hossein Mahdavi, Ahmad tavasoli
School of Chemistry, College of Science, University of Tehran, Tehran, Iran
The gas separation performance of mixed matrix membrane (MMM) containing blend of poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) with CuBTC MOF was investigated through the measuring pure gas permeance by the variable pressure/constant volume method. The drying phase inversion method was implemented to fabricate the membranes. Generally PVDF is recognized as gas barrier material but in some points incorporation of porous fillers in polymer or blending it with other polymers can improve its gas transport properties and turns PVDF into a tool for gas separation. The crystallized parts in semi-crystalline PVDF act as obstacles for gas permeance. PMMA is a common polymer which has been utilized to blend with PVDF for modifying polymer matrix in different applications. The interaction between PVDF and PMMA can prevent crystallization of PVDF. Decrease in the crystallinity of PVDF/PMMA blend membrane increased gas permeance through the membrane without loss in gas selectivity compared to the pure PVDF membrane. Incorporation of the high CO2 selective MOF, CuBTC, in PVDF/PMMA blend membrane intensified CO2/CH4 separations. The optimum PMMA/PVDF weight ratio of 30/70 was selected to fabricate MMM with CuBTC. The prepared MMMs were characterized by DSC, SEM and TGA techniques. Good interaction between MOF and polymer blend matrix exhibited improved gas transport properties in comparison with the unfilled membrane. An increscent up to 60% was observed for CO2/CH4 selectivity with 10 wt% of MOF loading compared to the pure blend membrane.
Gas separation, Mixed matrix membrane, Metal organic framework, poly(vinylidene fluoride)
Status : Paper Accepted (Poster Presentation)