UV-initiated free radical and cationic photopolymerizations of acrylate/ep oxide and acrylate/vinyl ether hybrid systems with and without photosensitizer
UV-initiated free radical and cationic photopolymerizations of acrylate/ep oxide and acrylate/vinyl ether hybrid systems with and without photosensitizer
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DOI：
10.1002/app.20597
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发表时间：
2004-08-05
影响因子：
3
通讯作者：
Hong, JW
中科院分区：
文献类型：
--
作者：
Cho, JD;Hong, JW
用动态机械热分析(DMTA)、量热分析(光差示扫描量热法和差示扫描量热法)和扫描电子显微镜研究了紫外光引发的丙烯酸酯/环氧化物和丙烯酸酯/乙烯基醚杂化光聚合在光敏剂和阳离子光引发剂存在下的各种性质。DMTA实验表明，杂化体系的紫外光固化可形成互穿聚合物网络。光热分析表明，在杂化体系中，丙烯酸酯的聚合速度快于环氧化物和乙烯基醚；光敏剂异丙基硫杂黄酮(ITX)的加入提高了环氧化物和乙烯基醚的聚合速率。扫描电子显微镜分析证实，氧抑制对自由基体系有明显的抑制作用，而阳离子体系和杂化体系几乎不受氧的抑制；加入ITX产生的光敏化增强了杂化体系的表面固化。(C)2004年威利期刊公司。
Various properties of UV-initiated acrylate/ epoxide and acrylate/vinyl ether hybrid photopolymerizations with and without photosensitizer in the presence of free radical and cationic-type photoinitiators have been determined by dynamic mechanical thermal analysis (DMTA), calorimetric analysis (photodifferential scanning calorimetry, photo-DSC; and differential scanning calorimetry), and scanning electron microscopy. DMTA experiments revealed that the UV curing of hybrid systems may produce interpenetrating polymer networks. Photo-DSC analyses indicated that the acrylates polymerized faster than the epoxide and vinyl ether in the hybrid systems; the addition of a photosensitizer, isopropylthioxanthone (ITX), increased the polymerization rate of the epoxide and vinyl ether in the hybrid systems. SEM analysis confirmed that the free radical system seemed to be significantly affected by oxygen inhibition, while the cationic and hybrid systems were not nearly inhibited by oxygen; the presence of photosensitization produced by the addition of ITX enhanced the surface curing of the hybrid systems. (C) 2004 Wiley Periodicals, Inc.