工程塑料应用
工程塑料應用
공정소료응용
ENGINEERING PLASTICS APPLICATION
2013年
8期
83-88
,共6页
双马来酰亚胺%固化动力学%力学性能%断裂韧性%热稳定性
雙馬來酰亞胺%固化動力學%力學性能%斷裂韌性%熱穩定性
쌍마래선아알%고화동역학%역학성능%단렬인성%열은정성
bismaleimide%curing kinetics%mechanical property%fracture toughness%thermostability
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2.22×107 s-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%。
用二烯丙基雙酚A(DABPA)對內增韌含醚酮結構的雙馬來酰亞胺樹脂(EK-BMI)進行改性，採用動態差示掃描量熱法、傅立葉變換紅外光譜法、Kissinger-Crane法和溫度-升溫速率外推法研究瞭EK-BMI/DABPA體繫的固化動力學過程，併研究瞭EK-BMI/DABPA體繫的力學性能、斷裂韌性及熱穩定性。結果錶明，EK-BMI/DABPA體繫的固化工藝參數為：165℃×2 h+180℃×2 h+238℃×4 h，後處理條件為250℃×5 h，錶觀活化能為97.50 kJ/mol，頻率因子為2.22×107 s-1，反應級數為0.9328。EK-BMI/DABPA體繫具有優良的力學性能，拉伸彊度和彎麯彊度分彆為89.42 MPa和152 MPa，其玻璃化轉變溫度為278℃，在260℃時仍能保持良好的力學性能，其臨界應力彊度因子和臨界應變能釋放率分彆可達1.14 MPa · m0.5和276.6 J/m2，錶現齣較好的斷裂韌性。此外,該體繫還具有較好的熱穩定性，體繫的初始分解溫度為412.95℃(T5%)，600℃時的質量保持率為37.91%，900℃時的質量保持率為32.17%。
용이희병기쌍분A(DABPA)대내증인함미동결구적쌍마래선아알수지(EK-BMI)진행개성，채용동태차시소묘량열법、부립협변환홍외광보법、Kissinger-Crane법화온도-승온속솔외추법연구료EK-BMI/DABPA체계적고화동역학과정，병연구료EK-BMI/DABPA체계적역학성능、단렬인성급열은정성。결과표명，EK-BMI/DABPA체계적고화공예삼수위：165℃×2 h+180℃×2 h+238℃×4 h，후처리조건위250℃×5 h，표관활화능위97.50 kJ/mol，빈솔인자위2.22×107 s-1，반응급수위0.9328。EK-BMI/DABPA체계구유우량적역학성능，랍신강도화만곡강도분별위89.42 MPa화152 MPa，기파리화전변온도위278℃，재260℃시잉능보지량호적역학성능，기림계응력강도인자화림계응변능석방솔분별가체1.14 MPa · m0.5화276.6 J/m2，표현출교호적단렬인성。차외,해체계환구유교호적열은정성，체계적초시분해온도위412.95℃(T5%)，600℃시적질량보지솔위37.91%，900℃시적질량보지솔위32.17%。
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 thermostability 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 2.22×107 s-1 and the curing reaction order is 0.932 8. 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 · m0.5and 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.
