Kinetics of UV curable alkyl 3-mercaptopropionate-vinyl silizane

2008, Volume 2, Issue 4

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Frontiers of Chemical Science and Engineering >> 2008, Volume 2, Issue 4 doi: 10.1007/s11705-008-0080-6

Kinetics of UV curable alkyl 3-mercaptopropionate-vinyl silizane

Department of Applied Chemistry, School of Science, Northwestern Polytechnical University;

Available online: 2008-12-05

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Abstract

Photopolymerization of vinyl-containing liquid silizane preceramic monomers copolymerized with thiol monomers, based on a step-growth radical polymerization mechanism, is a novel, rapid, inexpensive and simple technique for producing preceramic structures from liquid precursors. The kinetics of alkyl 3-mercptopropionate-vinyl silizane under UV irradiation is investigated by using real-time Fourier transform infrared (FT-IR) and photo-differential scanning calorimetry (photo-DSC). The experimental results show preliminarily that: (1) about 80% conversion of vinyl group has been achieved in the presence of a low concentration photoinitiator under UV irradiation; (2) by increasing the functionalities of the thiol group, the peak rate of copolymerization increases and the final conversion of the vinyl group decreases; (3) the copolymerization is primarily a bimolecular radical termination process; (4) the copolymerization is first-order, i.e., its rate is proportional to the vinyl group concentration and independent of the concentration of thiol group.

Keywords

step-growth ; irradiation ; bimolecular ; preceramic ; concentration photoinitiator

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