摘要
超声可显著提高胶黏剂的固化速率,加快胶接成型。采用双酚A型环氧树脂/低分子聚酰胺650体系胶黏剂树脂,以碳纤维增强复合材料(CFRP)/铝合金接头为黏接对象,通过超声工具头对接头中的CFRP板施加超声振动。通过差式扫描量热法(DSC)分析固化过程,证实对胶接接头施加超声振动可使胶黏剂的固化速率较常温固化提高26倍。通过监测振动过程中胶黏剂的温度变化,表明超声能够促进胶黏剂升温,有利于加速固化反应。对固化动力学方程进行变换,结合温度数据,建立超声辅助固化的变活化能模型,表明超声可显著降低固化反应活化能。通过傅里叶变换红外光谱(FTIR)分析发现超声可使环氧键、N—H键活化,提高反应活性。
Ultrasonic could significantly improve the curing rate of adhesive and accelerate the bonding process.The bisphenol A epoxy resin/low molecular weight polyamide 650 system adhesive resin was used to bond carbon fiber reinforced polymer(CFRP)/aluminum alloy joint.Ultrasonic vibration was applied to carbon fiber reinforced composite(CFRP)plate in the joint by ultrasonic sonotrode.Differential scanning calorimetry(DSC)was used to characterize the curing process.It was confirmed that ultrasonic vibration could increase the curing rate of the adhesive by 26 times.By monitoring the temperature change of the adhesive in the process of vibration,it shows that ultrasonic can promote the temperature rise of the adhesive and accelerate its curing.Based on the transformation of curing kinetics equation and the temperature data in the process,a variable activation energy model of ultrasonic assisted curing is established.Fourier transform infrared spectroscopy(FTIR)test shows that ultrasonic could directly activate the epoxy bond and N-H bond,and ultrasonic could improve the reactivity comparing with heating curing.
作者
孙展鹏
姚远
王辉
SUN Zhan-peng;YAO Yuan;WANG Hui(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China;School of Automotive Engineering,Wuhan University of Technology,Hubei,Wuhan 430000;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2021年第8期153-157,共5页
China Plastics Industry
基金
国家自然科学基金委员会资助(51775398,51805392)
111项目资助(B17034)
教育部创新团队发展计划(IRT_17R83)
中央高校基础研究资助(WUT:2018III067GX,2018III074GX)。
