Properties of polythiourethanes prepared by thiol-isocyanate click reaction

被引:32
|
作者
Shin, Junghwan [1 ]
Lee, Joonmo [1 ,2 ]
Jeong, Han Mo [2 ]
机构
[1] SKC Co Ltd, Adv Mat R&D Ctr, Suwon 16338, South Korea
[2] Univ Ulsan, Dept Chem, Ulsan 44610, South Korea
关键词
elastomers; photopolymerization; polyurethane; ENE NETWORKS; ACRYLATE PHOTOPOLYMERIZATIONS; ORTHOGONAL SYNTHESIS; ENTHALPY RELAXATION; KINETICS; POLYMERIZATION; CHEMISTRY; MECHANISM; BEHAVIOR;
D O I
10.1002/app.46070
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polythiourethane networks with systematic compositional variations of thiol [ethoxylated trimethylol-propane tri(3-mercapto-propionate), ETTMP1300 and pentaerythritol tetra(3-mercapto-propionate), PETMP] and isophorone diisocyanate (IPDI), i.e., IPDI/ETTMP1300/PETMP=100/100/0, 100/80/20, 100/60/40, 100/40/60, 100/20/80, and 100/0/100, were prepared by base catalyzed thiol-isocyanate click type reaction where the base catalyst (tributylamine, TBA) was photolytically generated using photolatent amine (TBAtetraphenylborate salt, TBAHBPh(4)). The kinetics of the polythiourethane network formation investigated using real-time infrared indicates that the thiol-isocyanate coupling reaction was successfully triggered photolytically and the conversion of both thiol and isocyanate reached near 100% in a matter of minutes. The T-g of the polythiourethane networks progressively increases (-8 to 143 degrees C by DMTA) as a function of the PETMP content due to the higher extent of crosslinks, also resulting in enhanced rubbery modulus. Very narrow full width at half maximum (15-28 degrees C) of tan peak was obtained for all six sets of polythiourethane networks, which is induced by the highly uniform and dense structures of thiol-based polymeric network. Energy damping performance of polythiourethane networks measured by nondestructive impact testing exhibited remarkably high (approximate to 95%) and the relationship with temperature was in accordance with tan peak. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46070.
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页数:8
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