PA和PSPA与1,3-二缩水甘油-5,5-二甲基海因的反应动力学及体系的热性能与力学性能

Reaction Kinetics,Thermal and Mechanical Properties of 1,3-Diglycidyl-5,5-Dimethyl Hydantoin Cured with PA and PSPA

分别使用邻苯二甲酸酐(PA)和聚葵二酸酐(PSPA)与1,3-二缩水甘油-5,5-二甲基海因(DGDH)进行固化反应。固化反应动力学和热稳定性分别使用DSC和TGA进行表征。考察了使用PSPA改性的DGDH/PA体系的力学性能、热变形温度和冲击断面形貌。动力学结果表明,DGDH/PSPA的反应活化能为75.94 kJ/mol,DGDH/PA的反应活化能仅为56.25 kJ/mol。DGDH/PA体系的热稳定性劣于DGDH/PSPA体系,在DGDH/PA体系中加入质量分数为34%的PSPA时,体系的冲击强度从2.16 kJ/m2提高到6.45 kJ/m2,但相应的热变形温度从132.2℃降低到51.8℃。与DGDH/PA体系断裂形成的光滑断面相比,使用PSPA改性的体系具有不规则的裂纹增长轨迹,从而提高了冲击韧性。

1, 3-diglycidyl-5, 5-dimethyl hydantoin （DGDH） was cured with phthalic anhydride （PA） and polysebacic polyanhydride （PSPA）. The reaction kinetics and heat stabilization, in the curing process were studied using DSC and TGA respectively. The DGDH/PA system was modified using the curing agent PSPA with different proportions. Tensile strength, fracture toughness, heat deflection temperature and morphology of fracture surface were characterized. Kinetic results show that DGDH/PSPA has activation energy of 75.94 kJ/mol, while that of DGD/PSPA is only 56.25 kJ/mol. The heat stabilization of DGDH/PA is worse than that of DGDH/PSPA, when 34% of PSPA was added into DGDH/PA system, the fracture toughness is improved from 2.16 kJ/m2 for the unmodified system to 6.45 kJ/m2 for the modified system, however, the heat deflection temperature decreases from 132.2 ℃ to 51.8 ℃, accordingly. Comparing with the unmodified system, the modified system has irregular tracks of crack propagation, which attributes to the improvement of fracture toughness.