Kinetics of UV curable alkyl 3-mercaptopropionate-vinyl silizane  

作　　者：Jiale SONG Lixin CHEN Yazhou WANG Weiwei CHEN Rumin WANG 

机构地区：[1]Department of Applied Chemistry,School of Science,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Frontiers of Chemical Science and Engineering》2008年第4期390-395,共6页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.20574056);Military Equipment Foundation of Defence(No.9140A12070106HK0338);the Doctorate Foundation of Northwestern Polytechnical University(No.CX200614).

摘　　要：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 tech-nique for producing preceramic structures from liquid pre-cursors.The kinetics of alkyl 3-mercptopropionate-vinyl silizane under UV irradiation is investigated by using real-time Fourier transform infrarcd(FT-IR)and photo-dif-ferential scanning calorimetry(photo-DSC).The experi-mental results show preliminarily that:(1)about 80%conversion of vinyl group has been achieved in the pres-ence of a low concentration photoinitiator under UV irra-diation;(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 ter-mination process;(4)the copolymerization is first-order,i.e.,its rate is proportional to the vinyl group concentra-tion and independent of the concentration of thiol group.

关 键 词：UV copolymerization KINETICS alkyl 3-mercap-topropionate vinyl silizane real-time FT-IR PHOTO-DSC 

分 类 号：O62[理学—有机化学]