Photo Polymerization of Thiol-Hyperbranched Polysilazanes

Jia Le Song; Peng Wei Hao; Chao Qiang Ye; Li Xin Chen; Wei Guang Li

doi:10.4028/www.scientific.net/AMR.683.266

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Photo Polymerization of Thiol-Hyperbranched Polysilazanes
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Photo Polymerization of Thiol-Hyperbranched Polysilazanes

Abstract:

The kinetics of UV curable thiol-hyperbranched polysilazanes (HBP) was studied by differential photo-scanning calorimeter (DPC) technology. The effects of photo initiator concentration [I], light intensity I₀ and temperature on the UV curing rate and the final unsaturated double bond conversion of thiol-HBP were investigated. The results indicate that the dependence of polymerization rate Rp on [I] and I₀, respectively, was found to fit with theoretical predictions very well at [I] no more than 0.50wt% and I₀ lower than 19.40mW/cm2. The kinetic parameters were calculated by autocatalytic model, and correspondingly, the total apparent reaction exponent and apparent activation energy are 8.76 and 13.97kJ/mol, respectively.