【摘要】 以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸羟乙酯(HEA)为单体采用自由基溶液聚合法合成羟基丙烯酸树脂,然后分别以丁二酸酐、戊二酸酐为羧基化试剂得到羧基位于不同长度柔性支链上的丙烯酸树脂。采用示差扫描量热法,热重分析研究了2种羧基丙烯酸树脂/异氰尿酸三缩水甘油酯体系的固化过程与热稳定性,并对体系的涂膜性能进行了测试。结果表明,柔性支链上羧基官能团距离树脂主链的距离越近,体系表观活化能越低,更有利于降低固化反应温度;固化产物的起始分解温度分别为368℃、372.4℃。利用Kissinger公式和Crane公式计算得到固化反应表观活化能Ea分别为43.97 k J/mol、62.5 k J/mol,表观反应级数分别为0.87、0.9。柔性侧链的引入可以提高涂膜的耐冲击性。更多还原

【Abstract】 The hydroxyl acrylic resin was synthesized by free solution polymerization of methyl methacrylate(MMA),butyl acrylate(BA)and hydroxyethyl acrylate(HEA),then the acrylic resins with carboxyl groups on the different length of flexible branched chain were obtained using succinic anhydride and glutaric anhydride as carboxyl reagent.The curing process and the properties of the two carboxyl acrylic resin/TGIC systems were investigated by DSC and TGA and the film properties of the systems were tested. The results showed that the more closer the distance between carboxyl functional groups on flexible branched chain and resin backbone,the more lower the apparent activation energy of system and that would more conducive to reduce the curing reaction temperature. The initial decomposition temperature of the cured products was 368 ℃and 372.4 ℃,repectively. The apparent activatin energy and reaction order calculated by means of Kissinger and Crane methods were 43.97 k J/mol and 62.5 k J/mol,0.87 and 0.9,repectively. The introduction of branched chain could improve the impact resistance of the coating films.更多还原