Hybrid dual-cure polymer networks via sequential thiol-ene photopolymerization and thermal ring-opening polymerization of benzoxazines

被引:33
作者
Narayanan, Jananee [1 ]
Jungman, Matthew J. [1 ]
Patton, Derek L. [1 ]
机构
[1] Univ So Mississippi, Sch Polymers & High Performance Mat, Hattiesburg, MS 39406 USA
基金
美国国家科学基金会;
关键词
Thiol-ene; Photopolymerization; Polybenzoxazine; Hybrid network; Dual-cure; MAIN-CHAIN; FUNCTIONALIZED BENZOXAZINES; THERMOSETTING RESINS; PHYSICAL-PROPERTIES; POLYBENZOXAZINES; MONOMERS; CHEMISTRY; MALEIMIDE; MOIETIES; BEHAVIOR;
D O I
10.1016/j.reactfunctpolym.2012.07.012
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Dual-cure hybrid polymer networks were prepared by sequential thiol-ene photopolymerization followed by thermal ring-opening polymerization of benzoxazines with the aim of increasing the glass transition temperature range of thiol-ene based materials and improving the processibility of polybenzoxazines. The hybrid networks are derived from a multifunctional, dually-polymerizable monomer possessing both bis-"ene" and bis-benzoxazine moieties enabling the formation of two networks through a common constituent monomer when combined with a multifunctional thiol. The photopolymerization kinetics of the thiol-ene reaction were investigated by real-time infrared spectroscopy. Sequential thermal ring-opening polymerization of the benzoxazine moieties incorporated into the thiol-ene network was characterized by FTIR and differential scanning calorimetry. The glass transition of the hybrid material was observed at 150 degrees C; however, competing thiol-ene (radical-mediated) and thiol-benzoxazine (nucleophilic ring-opening) reactions during the UV cure yield a heterogeneous network structure. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:799 / 806
页数:8
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