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本文研究了双酚A二醋酯与间苯二甲酸在247℃、257℃和267℃下的熔融缩聚动力学。缩聚产物的数均聚合度随时间的变化,是通过以标准氢氧化钠溶液滴定逸出的醋酸量换算而得。以Runge-Kutta法求得动力学微分方程组的数值解。再以不同的单体与多体反应速率常数和酯交换反应速率常数值代入方程组,用计算机求得模拟曲线,由模拟曲线与实际曲线的比较提出了该缩聚反应的机理及有关各基元反应速率常数之比分别为k_(11)/k_(mn)=0.4211,k_(1n)/k_(nm)=1,k_(1/n)k_(mn)=0.05,说明该缩聚反应为具有酯交换反应的三速率常数的反应过程。
In this paper, the melt polycondensation kinetics of bisphenol A diacetate and isophthalic acid at 247 ℃, 257 ℃ and 267 ℃ were studied. Polycondensation product number-average degree of polymerization over time, is by standard sodium hydroxide solution titration derived from the amount of acetic acid derived. Calculating the numerical solutions of dynamical differential equations by Runge-Kutta method. Then, different monomer and multibody reaction rate constants and transesterification reaction rate constant values are substituted into the equations, and the simulation curves are obtained by computer. The mechanism of the polycondensation reaction and the correlation between each elementary unit The reaction rate constants were k11 / k mn = 0.4211, k1n / k nm = 1, k1 / n k mn = 0.05, indicating that the polycondensation reaction is carried out with Transesterification reaction rate constant of the reaction process.