Curing behavior of epoxidized soybean oil with biobased dicarboxylic acids

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• 作者：Run-Tao Zeng ; Ying Wu ; Yi-Dong Li ; ^{liyidong@swu.edu.cn} ; Ming Wang ; Jian-Bing Zeng ; ^{jbzeng@swu.edu.cn}
• 关键词：Epoxidized soybean oil ; Dicarboxylic acid ; Curing behavior
• 刊名：Polymer Testing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：57
• 期：Complete
• 页码：281-287
• 全文大小：1745 K
• 卷排序：57

文摘

In this study, we report the curing of ESO with biobased dicarboxylic acids (DCAs) with different carbon chain-lengths to synthesize fully sustainable polymers. Both non-isothermal and isothermal curing processes analysis indicated that the curing rate and activation energy decreased with increasing chain-length of DCAs. The optimum COOH/epoxy molar ratio is 0.7 for preparation of ESO/DCA cured product with maximum degree of crosslinking. Addition of 4-N, N-dimethylaminopyridine (DMAP) as a catalyst can efficiently accelerate the curing rate and reduce activation energy. We systemtically studied the effect of chain-length of DCAs on the physical properties of cured products, and found that with increase in chain-length of DCAs, the glass transition temperature of the cured ESO/DCA decreased, the tensile strength and Young's modulus increased while elongation at break decreased, due to the decreased crosslinking density resulted from the increased chain-length between crosslinking sites. All cured ESO/DCA showed excellent thermal stability with initial decomposition temperature of higher than 340 °C.