自催化
固化(化学)
差示扫描量热法
反应级数
环氧树脂
活化能
材料科学
傅里叶变换红外光谱
等温过程
反应机理
高分子化学
化学工程
复合材料
动力学
化学
物理化学
热力学
有机化学
催化作用
反应速率常数
物理
量子力学
工程类
作者
Zhihang Ma,Xiao Wang,Junru Li,Xinlin Li,Chuanwei Zhang,Ruyi Zhang,Yan Gu,Pengfei Zhang
摘要
Abstract The reaction process and curing mechanism of self‐healable epoxy resin TGDDM and curing agent TA are complicated. In this paper, the curing reaction kinetic mechanism of the system is studied from the perspective of isoconversional models. The n th‐order model and autocatalysis model are established for observations of heat flow versus temperature and time during real‐time curing obtained by non‐isothermal differential scanning calorimetry (DSC), and evaluated under the standards of MSE, RMSE, and R ‐square. Under the guidance of least squares fitting, the pre‐exponential factor ( A ), the activation energy (), the order of models ( n, m ) and other parameters in of the model are mainly estimated by Kissinger method, Ozawa method, Malek method, and other methods. The correlation between the activation energy () of the reaction and the degree of conversion also analyzed by the Flynn‐Wall‐Ozawa method. The chemical reaction of the system is studied by Fourier transform infrared (FTIR) and the self‐healing property of the system is characterized by scanning electron microscope (SEM). It was found that the esterification reaction occurred in the system, and the realization of the self‐healing property was also due to the transesterification reaction. In addition, the effect of the accelerator on the system is analyzed by the established autocatalysis model and dynamic mechanical analysis (DMA). The result shows that the addition of the accelerator does not change the curing reaction mechanism of the system, but accelerated the reaction process and increased the glass transition temperature.
科研通智能强力驱动
Strongly Powered by AbleSci AI