期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 47, 期 1, 页码 14-24出版社
WILEY
DOI: 10.1002/pola.23089
关键词
networks; oligomers; photopolymerization; thiol-ene
Thiol oligomers were copolymerized with a triallyl ether by a photoinduced polymerization process. These oligomeric thiol-ene systems comprise the same components as a photopolymerized thiol-ene-acrylate ternary system, yet the photopolymerized networks have much lower glass transition temperatures. An investigation into the effect of oligomeric thiol design on network formation was conducted by analyzing the reaction kinetics and thermal/mechanical properties of the thiol-ene networks. Real-time FTIR analysis shows that total conversion is > 90% for all thiols investigated. Photo-DSC analysis shows that the maximum exotherm rate is roughly equivalent for all of the thiols when the equivalent weight of the thiol is taken into account. As would be expected, the glass transition temperature and tensile strength increase with thiol functionality and lower thiol equivalent weight for thiols with functionality from 2 to 4. Films made using the oligomeric thiols have essentially the same glass transition temperatures and tensile modulus values regardless of thiol design. These results distinguish the method for generation of networks consisting of an initial Michael reaction of thiols and acrylates followed by a photoinitiated copolymerization with a multifunctional ene from the traditional photolysis of the corresponding thiol-ene-acrylate ternary systems with no Michael reaction. (c) 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 14-24, 2009
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