標題: Effect of tertiary amines on yellowing of UV-curable epoxide resins
作者: Chiang, Tzu Hsuan
Hsieh, Tsung-Eong
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: tertiary amines;yellowness;UV-curable epoxide resin
公開日期: 1-Dec-2007
摘要: The work reported demonstrates that the yellowness of UV-curable epoxide resins can be improved by adding certain tertiary amines in appropriately determined amounts. According to the results of our experiments, 2.0 wt% benzoyl peroxide added to a resin effectively enhances the crosslinking density, and phenolic free radicals are produced during UV curing, which consequently induce yellowness via the reaction of oxygen and the free radicals. Imidazole (1-amine) and tertiary amines, including 1,2-dimethylimidazole (2-amine), 2,4,6-tris(dimethylaminomethyl)phenol (3-amine), 1-methylimidazole (4-amine) and 2-methylimidazole (5-amine), were chosen to be added to resins, and their effects on UV conversion and yellowness were investigated. According to the experimental results, tertiary amines in the resin can provide a certain degree of improvement in yellowness index (Delta YI) and color parameter (Delta E*(ab)) of the resin sample. Whatever the type of tertiary amine, it is found that the optimum content of amine in resin is 1.0 wt%. Also, among the studied amines, the 3-amine exhibits the highest UV reactivity and the best efficiency for yellowness improvement with values of Delta a*, Delta b*, Delta YI and Delta E*(ab) as low as -1.4, 6.23, 11.27 and 6.48, respectively. (C) 2007 Society of Chemical Industry.
URI: http://dx.doi.org/10.1002/pi.2300
http://hdl.handle.net/11536/10083
ISSN: 0959-8103
DOI: 10.1002/pi.2300
期刊: POLYMER INTERNATIONAL
Volume: 56
Issue: 12
起始頁: 1544
結束頁: 1552
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