反应注射成型体系中的界面现象：II.理论研究

在反应注射成型体系中存在反应诱导混合现象，本文通过理论分析对这一现象加以解释。采用变量分离法，求得无限大反应界面两侧流体运动速度表达式。研究结果表明，界面区反应生成的初始生成物在空间上的浓度梯度及反应在界面上造成的温度梯度，引发了界面张力梯度，从而在反庆界面附近引起流体运动。初始生成结构对自动混合有显著的影响。当不考虑反应过程中物料粘度变化时，反应速度的加快，两相粘度差的增大及扰动波数α的增加，均

Interfacial Phenomena in Chemical System of Reaction Injection Moulding II.Theoretical Study

The phenomena of reaction induced mixing in reaction injection moulding has been analysed theoretically.Expressions for fluid velocities near infinite interface were obtained by variableseparation method.It was found that the gradient of concentration of the initial product and that of temperature led to interfacial tension gradient,which was responsible for the presence of spontaneous mixing near interface.The structure of initial product had a significant effect on spontaneous mixing.Ignoring the change of viscosity in the reaction,we could reason out that the faster the reaction,the greater the difference between reactant viscosities and the larger the disturbance wavenumber,the stronger the spontaneous mixing.That the reactants of low viscosity always dispersed into the reactants of high viscosity could also be explained by the velocity expression.