摘要
以端羟基聚环氧丙烷 10 0 0、甲苯二异氰酸酯 (TDI)、2 -甲基咪唑为原料 ,合成了扩链脲 TI。利用DSC、动态热机械分析仪 DMA、冲击试验机及扫描电镜 (SEM)等手段对 TI改性的环氧树脂 E- 5 1/甲基四氢化邻苯二甲酸酐 (MTHPA)固化体系的反应活性、动态力学行为、冲击性能、断裂面形态结构进行了系统研究。结果表明 ,改性后的 E- 5 1/MTHPA体系反应活性明显提高 ,固化反应峰顶温度较未改性体系降低 160℃～ 2 0 0℃ ,固化反应的表观活化能由未改性体系的 160 .3k J/mol降至 63k J/mol～ 87k J/mol。同时与未改性体系相比 ,经过改性的环氧树脂固化体系冲击强度有较大的提高 ,在 TI含量为5 %时体系的玻璃化转变温度 Tg 达到最高 。
An extended-chain urea(TI) containing flexible chain was synthesized from polypropylene oxide-1000, tuluenediisocyanate( TDI) and 2-methylimidazole. The reactive activity, dynamic mechanical behavior, impact property and morphology of the curing system were systematically investigated by DSC, DMA, impact tester and SEM respectively. Results show that the curing activity of modified epoxy resin(E-51)/methyl tetrahyhrophathalate(MTHPA) curing system is so greatly enhanced that the curing reaction peak temperature decreases 160 ℃~200 ℃, and the apparent activation energy of curing reaction is reduced from 160.3 kJ/mol to 63 kJ/mol^87 kJ/mol. In addition, the impact strength of the curing system modified with TI is higher than the unmodified system. Maximum glass transition temperature of the curing system is at TI content of 5%, and the fracture surfaces of the modified systems display tough fracture feature.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2003年第1期69-72,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金 ( 5 9473 0 2 8)
天津市自然科学基金资助项目 ( 983 60 3 111)
