Si3N4 ceramic was prepared with pyrolyzing ceramic precursor of UV cured multi thiol-vinyl silizane.The results of in-suit FTIR show that thiol-vinyl silizane curing system was polymerized rapidly with a little photoi...Si3N4 ceramic was prepared with pyrolyzing ceramic precursor of UV cured multi thiol-vinyl silizane.The results of in-suit FTIR show that thiol-vinyl silizane curing system was polymerized rapidly with a little photoinitiator.The photopolymerization rate was promoted,but the final vinyl bond conversion was depressed with enhancing the functionality of thiol group.The results of DMA and TGA show that Tg of the copolymer films of thiol-vinyl silizan cured by UV was elevated,however,the maxiumu rate of mass loss was decreased with increasing the functionality of thiol group.The ceramic yield was determined by the composition of copolymer and was independent of the thiol functionality.A majority of Si3N4 microcrystalline was obtained after pyrolyzing at 1400 ℃ for 15 h in N2 atmosphere.展开更多
文摘Si3N4 ceramic was prepared with pyrolyzing ceramic precursor of UV cured multi thiol-vinyl silizane.The results of in-suit FTIR show that thiol-vinyl silizane curing system was polymerized rapidly with a little photoinitiator.The photopolymerization rate was promoted,but the final vinyl bond conversion was depressed with enhancing the functionality of thiol group.The results of DMA and TGA show that Tg of the copolymer films of thiol-vinyl silizan cured by UV was elevated,however,the maxiumu rate of mass loss was decreased with increasing the functionality of thiol group.The ceramic yield was determined by the composition of copolymer and was independent of the thiol functionality.A majority of Si3N4 microcrystalline was obtained after pyrolyzing at 1400 ℃ for 15 h in N2 atmosphere.