复合材料胶接用发泡胶的工艺验证与固化动力学

Process Validation and Cure Kinetics of Foam Adhesive for Composite Bonding

通过动态差示扫描量热分析(DSC)研究了一种中温固化的发泡胶的固化工艺和固化动力学。为证实DSC峰值温度T_(p)与升温速率β的自然对数存在线性关系,在DSC测试中除采用β为5、10、15和20 K/min的升温速率组合外,还特意设定升温速率β为1、2.718、7.389和20 K/min,则lnβ等于或近似为0、1、2、3以便于计算,由此可确定固化工艺参数并快速地估算活化能E_(a)。结合其他关于热固化、热分解甚至一些高分子材料结晶的文献数据,进一步证实了T_(p)与lnβ往往存在线性关系。利用上述线性关系所获得的特性温度参数T_(1)和ΔT值,可以解释活化能的大小并快速求解动力学数据。研究结果建立并证实了区别于Kissinger和Ozawa方法的另一种简易而且可靠的反应动力学求解方法,并用数学极限的方法进行推导给出了活化能的解析解。上述简易方法求解热致反应或结晶变化的动力学参数是合理有效的。

The curing process and cure kinetics of a moderate-temperature-curing adhesive foam had been investigated by dynamic differential scanning calorimetry(DSC)experiments.To confirm a linear relationship between the peak temperatures(T_(p))of DSC curves and the natural logarithm of heating rates(β),in addition to the combination of heating ratesβof 5,10,15 and 20 K/min in DSC tests,heating ratesβof 1,2.718,7.389 and 20 K/min were designedly set,so that lnβwould be equal and approximate to 0,1,2 and 3 for easy calculation,thus curing parameters and the apparent activation energy(E_(a))could be easily and quickly determined.Empirical linear relationships between T_(p) with lnβhad been sustained by a series of literature data about heating cure,thermal decomposition and crystallization of some polymers.Using the characteristic temperature parameters T_(1) andΔT obtained from the above linear relationship,the magnitude of the activation energy(E_(a))could be explained and the kinetic data could be quickly solved.The results have established and proved a simple and reliable kinetic solution other than methods by Kissinger and Ozawa.The simple method for solving the kinetic parameters of thermalinduced reaction or crystallization change is reasonable and effective.