Preparation of γ-methacryloxypropyl Trimethoxy Silane Cross-linked PDMS Membrane for Pervaporation Recovery of Butanol

The present study aimed to improve the pervaporation(PV) performances of polydimethylsiloxane(PDMS) membranes by using special cross-linkers. The γ-methacryloxypropyl trimethoxy silane(KH-570) cross-linked PDMS membranes were fabricated and characterized by FTIR, TGA, WCA, DSC, SEM, and swelling properties. Experimental results showed that the separation factor of the membrane increased slightly with the feed temperature whereas permeate flux increased. Butanol flux increased slowly with the feed concentration while the water flux decreased. The overall result indicated that the separation factor decreased slowly with the feed concentration. The membrane, with a thickness of 55 μm, showed a total flux of 308.4 g/m~2h with a separation factor of 26.8 at 70 ℃, and butanol permeability reached 11.13×10~5 Barrer with a membrane selectivity of 56.0.