摘要
用二烯丙基双酚A(DABPA)对内增韧含醚酮结构的双马来酰亚胺树脂(EK-BMI)进行改性,采用动态差示扫描量热法、傅立叶变换红外光谱法、Kissinger-Crane法和温度–升温速率外推法研究了EK-BMI/DABPA体系的固化动力学过程,并研究了EK-BMI/DABPA体系的力学性能、断裂韧性及热稳定性。结果表明,EK-BMI/DABPA体系的固化工艺参数为:165℃×2 h+180℃×2 h+238℃×4 h,后处理条件为250℃×5 h,表观活化能为97.50 kJ/mol,频率因子为2.22×107s-1,反应级数为0.9328。EK-BMI/DABPA体系具有优良的力学性能,拉伸强度和弯曲强度分别为89.42 MPa和152 MPa,其玻璃化转变温度为278℃,在260℃时仍能保持良好的力学性能,其临界应力强度因子和临界应变能释放率分别可达1.14 MPa·m0.5和276.6 J/m2,表现出较好的断裂韧性。此外,该体系还具有较好的热稳定性,体系的初始分解温度为412.95℃(T5%),600℃时的质量保持率为37.91%,900℃时的质量保持率为32.17%。
A kind of internal toughened bismaleimide containing ether and ketone groups （EK-BMI）was modified by diallyl bisphenol A（DABPA）. The curing kinetics process of EK-BMI / DABPA system was investigated by non-isothermal differential scanning calorimetry, Fourier transform infrared spectroscopy, Kissinger-Crane and temperature-heating speed extrapolation. In addition, mechanical property, fracture toughness and therrnostability of the system were also studied. The results show that the curing technology is 165℃×2 h＋180 ℃× 2 h＋238 ℃× 4 h, and the post-processing technology is 250 ℃× 5 h. The apparent activation energy is 97.50 kJ/mol and frequency factor is 2.22 x 107 s-1 and the curing reaction order is 0.9328. The cured resin has excellent mechanical property, the tensile strength and flexural strength are 89.42 MPa and 152 MPa respectively. The glass transition temperature of the system is 278℃ and the system has good mechanical property up to 260 % . The plan strain critical stress intensity factor and the plan strain critical strain energy release rate of the system could reach 1.14 MPa. m^0.5 and 276.6 J/ m2 respectively, which mean that the system has good fracture toughness. In addition, the system has good thermostability, and the initial decomposition temperature （T5%） of the system is 412.95℃, and the weight residual rate at 600 ℃ and 900℃ are 37.91% and 32.17% respectively.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2013年第8期83-88,共6页
Engineering Plastics Application
关键词
双马来酰亚胺
固化动力学
力学性能
断裂韧性
热稳定性
bismaleimide
curing kinetics
mechanical property
fracture toughness
thermostability
