Study on Synthesis of Thoreau-modified 3, 5-Dimethyl-Thioltoluenediamine Used as Epoxy Resin Curing Agent and Its Performance

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Peng, Yongli^1 ; Xiao, Wenzheng^1

College of Materials, Wuhan Institute of Technology, Wuhan, China^1

关键词: Autocatalytic model;    Diffusion control;    Epoxy resin curing agents;    Exothermic enthalpy;    Experimental curves;    Kinetics control;    Thermal condition;    Volume shrinkage;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012027/pdf
DOI  :  10.1088/1757-899X/207/1/012027

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A novel curing agent Thoreau modified 3, 5-Dimethyl-thioltoluenediamine was synthesized and its molecular structure was characterized by FTIR and DSC. The curing kinetics of a high toughness and low volume shrinkage ratio epoxy system (modified DMTDA/DGEBA) was studied by differential scanning calorimetry (DSC) under noni so thermal conditions. The data were fitted to an order model and autocatalytic model respectively. The results indicate that in order model deviates significantly from experimental data. Malik's method was used to prove that the curing kinetics of the system concerned follow single-step autocatalytic model, and a "single-point model-free" approach was employed to calculate meaningful kinetic parameters. The DSC curves derived from autocatalytic model gave satisfactory agreement with that of experiment in the range 5K/min∼25K/min. As the heating rate increased, the predicted DSC curves deviated from experimental curves, and the total exothermic enthalpy declined owing to the transition of competition relationship between kinetics control and diffusion control.