2,4,6-三(羟基苯甲基氨基)-均三嗪的合成及其与双酚A型环氧树脂的固化行为研究

合成了一种含三嗪环结构的环氧树脂固化剂2,4,6-三(羟基苯甲基氨基)-均三嗪(MFP).用动态DSC和原位红外光谱对MFP/DGEBA(双酚A型环氧树脂)体系的固化行为进行了研究.动态DSC研究表明,由于MFP分子结构中存在两种活泼氢(酚羟基氢和仲胺氢),固化反应存在明显的两个峰,相对应的表观活化能分别为70.5 kJ.mol-1和86.5 kJ.mol-1(Kissinger法),通过与另一相似化合物固化DGEBA的比较可知,在MFP固化DGEBA的过程中,酚羟基与环氧基反应相对较难.原位红外动力学结果很好地支持了上述结论.

SYNTHESIS OF 2,4,6-TRI(HYDROXYLPHENYLMETHYLAMINO)-s-TRIAZINE AND ITS CURING BEHAVIOR AND MECHANISM WITH DGEBA

(2,4,6-tri(hydroxylphenylmethylamino)-s-trizine)(MFP) was synthesized and its structure was characterized by infrared spectroscopy(IR),()~1H-NMR and element analysis.The kinetics and mechanism for curing of diglycidyl ether of bisphenol A (DGEBA) with MFP were studied by differential scanning calorimeter(DSC) and in situ IR.The results of dynamic DSC thermograms showed that two peaks presented in the proceeding of reaction because of two kinds of active hydrogen in the structure of the MFP molecule,and the first exothermic peak resulted from the the reaction of amine with epoxy group(E_a=70.5 kJ·mol~(-1),calculated by Kissinger method) and the second exothermic peak resulted from the reaction of hydroxyl with epoxy group(E_a=86.5 kJ·mol~(-1),Kissinger method) by comparing with the curing process of DGEBA with a model compound 2,4,6-(tri(omethylhydroxyphenyl-)methylamino)-s-trizine(MFoP).The results of in situ FTIR confirmed this conclusion.