Modification of silicalite-1 by vinyltrimethoxysilane (cas 2768-02-7) (VTMS) and preparation of silicalite-1 filled polydimethylsiloxane (PDMS) hybrid pervaporation membranes

Add time:07/16/2019    Source:sciencedirect.com

In preparation of inorganic particles filled polymer membranes, coupling agents can help to improve the compatibility between inorganic filler and polymer matrix. In this paper, surface modification of silicalite-1 was performed by a coupling agent, vinyltrimethoxysilane (cas 2768-02-7) (VTMS), and hybrid pervaporation membranes were prepared by incorporating the unmodified or VTMS-modified silicalite-1 into polydimethylsiloxane (PDMS). The VTMS-modified silicalite-1 particles and hybrid membranes were characterized by FT-IR, 29Si CP MAS NMR, DSC, TGA, XRD and SEM. The results showed that the coupling agent VTMS was readily grafted on the surface of silicalite-1 by hydrolysis reaction and condensation reaction, and the chemical linking between the –CHCH2 group on the surface-modified silicalite-1 and –Si–H on the PDMS substantially eliminated the nonselective voids inside the membrane. When used to separate acetone, butanol, ethanol (ABE) from aqueous solution, a higher selectivity was obtained with the VTMS-modified silicalite-1/PDMS hybrid membrane. Moreover, the surface modification of silicalite-1 improved its dispersion in PDMS and increased the maximal loading of silicalite-1 in membrane preparation, and thus further enhanced the separation factor of the membrane.

▶ Silicalite-1 could be modified by vinyltrimethoxysilane (VTMS). The modification did not change the crystal framework of silicalite-1, but enhanced its hydrophobicity and affinity with polydimethylsiloxane (PDMS) matrix. ▶ VTMS modification helped to make interfacial void-free hybrid membranes with higher silicalite-1 loading. ▶ VTMS modification enhanced the selectivity of the silicalite-1/PDMS hybrid membrane in separating butanol from acetone, butanol and ethanol (ABE) aqueous solution by pervaporation.

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