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: | 1-十二月-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 |
顯示於類別: | 期刊論文 |