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 I0and 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 I0lower 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.

Borazine-type single source precursor with vinyl to SiBCN ceramic

“…To solve this problem, we selected vinyl groups, which replaced the acrylate groups to eliminate the negative effect on ceramic yield. The vinyl groups can promote polymerization by heating without the use of curing agent or under UVirradiation with a curing agent that contains SH 20) bond or SiH 21) bond. Moreover, vinyl groups can improve the amount of carbon content which is the main conductive phase in high C-containing PDCs.…”