EP/DDM固化工艺及增韧改性研究

EP/DDM Curing Process and Toughening Modification

采用差示扫描量热法(DSC),根据Kissinger方程和Flynn-Wall-Ozawa方法,研究固化体系的固化动力学,运用非等温升温速率的方法确定EP/DDM固化体系的最佳固化工艺,选用011N和010N型奇士增韧剂对固化物力学和介电性能进行对比.结果表明:固化反应活化能Ea为52.76k J/mol;运用T-β外推法,确定EP/DDM固化体系的最佳固化工艺为80℃/2 h+125℃/1 h+160℃/1 h,此时固化物的拉伸强度和冲击强度达到最佳分别为65.52 MPa和24.29 k J/m2,分别提高了8.84%和32.52%;介电常数和介电损耗分别为3.11和0.003 2,固化物的绝缘性能较好,确定011N和010N型增韧剂最佳配比分别为16%和14%,此时固化物的冲击强度分别为29.85 k J/m2和26.87 k J/m2,分别提高22.89%、10.62%,实现了增韧改性的效果.

Using differential scanning calorimetry （DSC） and according to the equation of Kissinger and the method of Flynn-Wall-Ozawa, the curing kinetics of curing system is studied. The best curing process for the curing system of EP/DDM is determined by using the method of non-isothermal heating rate and the mechanical and dielectric properties of the cured are compared by using two kinds of 011N and 010N QiShi toughening agents. The results show that：the activation energy Ea for the curing reaction is 52.76 kJ/mol,the extrapolation method of T-f3 is used to determine the best curing process for the curing system：80 ℃/2 h ＋ 125 ℃/1 h ＋ 160 ℃/1 h,here the tensile strength and impact strength of the cured a- chieved to the best are 65.52 MPa and 24. 29 kJ/m^2, increasing by 8.84 % and 32.52 % respectively. Dielectric constant and dielectric loss are 3.11 and 0. 003 2, the insulation performance of the cured is bet- ter, and the optimum proportion of 011N and 010N QiShi toughening agent for the EP/DDM curing sys- tem is deter mined,they are 16 % and 14 % respectively. At this point,the impact strength of the cured is 29.85 kJ/m^2 and 26.87 kJ/m^2, increasing by 22. 89 % and 10. 62 % respectively, and achieving the toughening effect.