Enhancing the Separation Performance of Polyimide based Mixed Matrix Membranes by Miniaturization and Silane Surface Modification of Filler Particles

摘要

The SAPO-34 zeolite is suited for the natural gas purification because its structure has a 0.38 nm pore size.SAPO-34 zeolite had been dispersed into the polymer matrix to prepare the mixed matrix membranes(MMMs)1).The MMMs can combine the merits of the inorganic membrane and polymer membrane2).However,some non-selective interfacial defects such as sieve-in-a-cages will form in the MMMs due to the poor affinity between inorganic filler and polymer matrix.Surface functionalization with the silane coupling agent can improve the compatibility of the filler particles and polymer4).Miniaturization of the filler particles by mechanical method can also be considered to improve the defects5).In this study,the SAPO-34 zeolite powder was treated by silane surface modification and beads mill for the preparation of the polyimide-based MMMs.