在线红外法研究季戊四醇丙烯醛树脂的预聚反应动力学

发布时间：2018-07-28 14:24

【摘要】：采用在线红外法研究了季戊四醇丙烯醛树脂的预聚反应动力学,在反应温度为338.15,348.15 K和358.15 K及催化剂硫酸二乙酯酸(DES)的用量为2%和4%时,监测反应体系中官能团=CH_2浓度的变化,计算得出了该聚合反应的动力学方程,并对固化产物的力学性能进行了研究。结果表明:该反应为二级反应,但该反应初期和后期的表观反应速率、反应活化能相差很大,当DES用量为2%时,反应初期和后期的活化能分别为36.5 kJ·mol~(-1)和49.6.kJ·mol~(-1);当DES用量为4%时,反应初期和后期的活化能分别为61.0 k J·mol~(-1)和69.1 kJ·mol~(-1);DES用量为2%和4%时,DES的用量对固化产物的力学性能影响不明显;反应温度对固化产物的力学性能有显著影响,当DES的用量为2%和4%时,出现在338.15 K时的最大抗拉强度分别为41.99 MPa和41.17 MPa,出现在358.15 K时的最大断裂延伸率分别为8.47%和7.27%。
[Abstract]:The kinetics of prepolymerization of pentaerythritol acrolein resin was studied by on-line infrared method. The concentration of functional group was monitored at the reaction temperature of 338.15348.15K and 358.15 K and the amount of diethyl sulfate (DES) as 2% and 4wt% respectively. The kinetic equations of the polymerization were calculated and the mechanical properties of the cured products were studied. The results show that the reaction is a second order reaction, but the apparent reaction rate and the activation energy of the reaction are very different between the initial and late stages of the reaction. When the amount of DES is 2, the activation energy of the initial and late reaction is 36.5 kJ mol-1 and 49.6.kJ mol-1, respectively, and when the amount of DES is 4%, the activation energy of the reaction is 36.5 kJ mol-1 and 49.6.kJ mol-1, respectively. The activation energies at the initial and late stages of the reaction were 61.0 kJ / mol ~ (-1) and 69.1 kJ / mol ~ (-1), respectively, and the amount of des had no obvious effect on the mechanical properties of the cured products, and the reaction temperature had a significant effect on the mechanical properties of the cured products. The maximum tensile strength at 338.15 K was 41.99 MPa and 41.17 MPA, and the maximum elongation at 358.15 K was 8.47% and 7.27%, respectively, when the dosage of DES was 2% and 4%, respectively.
【作者单位】：中国工程物理研究院化工材料研究所;
【基金】：国家火炸药专项
【分类号】：O631.5

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