A hyperbranched polysilazanes(HBP) with multifunctionality of allyl end groups was prepared by polymerization reaction via hydrosilylation of AB2 type monomer(N-diallyamine) dimethlsilane

which was synthesized by aminolysis of Me2HSiCl.The molecular structure of HBP was characterized and determined by FT-IR

1H-NMR spectra analysis and GPC.Further more

the photo-initiated curing kinetics of HBP with thiol compound was studied by differential photoscanning calorimetry (DPC) technology.The comparing analysis among HBP

HBP-thiol compound and low-functionality monomer of B2M -thiol compound indicated that thiol functional group reacts with allyl functional group quickly under lower amount of photoinitiator (0.1 wt%) and lower light intensity (about 5 mW/cm2) in ambient condition.The curing rate and ultimate conversion of allyl group in HBP-thiol compound is higher than that in HBP

however

the ultimate conversion of allyl group in HBP-thiol compound is lower than that in B2M- thiol compound due to the unique hyperbranched structure and high multifunctionality.The effects of photoinitiator concentration ［A］

UV light intensity (I0) and reaction temperature on the UV curing rate and the final allyl bond conversion of HBP-thiol compound system were also investigated by DPC.The results indicate that the effects of photoinitiator concentration (［A］)

UV light intensity (I0) and temperature on kinetics of HBP-thiol compound reveal that the curing rate (Rp) is directly proportion to square root of ［A］ and I0

respectively

which is found to fit with theoretical predictions very well at ［A］ no more than 050 wt% and I0 lower than 19.40 mW/cm2 Kinetics parameters were determined for HBP-thiol compound according to an autocatalytic model with a diffusion coefficient attached.The total apparent reaction exponent and apparent activation energy are 8.76 and 13.49 kJ/mol

respectively.