摘要
采用苯基缩水甘油醚对2-甲基咪唑进行改性,制备了几种不同改性比例的改性2-甲基咪唑(M-2MI),对其反应机理和结构进行了讨论。对环氧树脂/双氰胺/M-2MI体系的凝胶时间、玻璃化转变温度(Tg)进行了测定,并采用差示扫描量热法研究了体系的固化反应动力学。结果表明,M-2MI对环氧树脂/双氰胺具有良好的促进活性,计算得到的表观活化能为77.0k J/mol。随着苯基缩水甘油醚用量的增加,固化物的Tg有逐渐降低的趋势。粘接性能试验结果表明,采用M-2MI作为促进剂比采用未经改性的2-甲基咪唑作为促进剂的剪切强度和剥离强度更高。
Several modified 2-methyl imidazoles （M-2MI） with different phenyl glycidyl ether/2-methyl imidazole molar ratios were prepared. The mechanism of the reaction and the structure of the prepared M-2MI were discussed. The gel time and glass transition temperature （Tg） of the epoxy/dicyandiamide/M-2MI curing systems were measured. The curing reaction kinetics of this system was studied by DSC. The results showed that the modified imidazoles had good accelerating reactivity for the epoxy/dicyandiamide systems. The apparent activation energy of the accelerated epoxy system was calculated to be 77.0kJ/mol by the Kissinger equation. The Tg of the cured resin decreased with the increase of phenyl glycidyl ether amount. The adhesives which were accelerated with the prepared modified imidazoles showed higher lap shear strength and peel strength than those with unmodified 2-methyl imidazole.
出处
《化学与粘合》
CAS
2016年第6期417-419,470,共4页
Chemistry and Adhesion
关键词
促进剂
改性咪唑
环氧树脂
Curing accelerator
modified imidazole
epoxy resin
