论文部分内容阅读
在光散射的理论中,密度均方起伏η2在两相完全不相容的体系中(界面间也不存在相互粘附)η2=Φ1Φ2(α1-α2).对于界面间有相互作用或形成一定的相容区时,η2将变小,则有η2=(α2-α1)2(ψ1ψ2-ψ3/6).α1、α2为两组元分别的极化率,ψ1、ψ2为两组元的体积分数.本文根据部分相容的聚合物共混体系中的分散相尺寸γ和积分不变量θ,可计算出ψ3,并提出相间弥散层的概念,进而计算出弥散层的厚度d,从而发展了光散射理论.激光小角散射计算的弥散层厚度d与X光小角散射计算的界面层厚度σb是相对应的.在计算中应用相关距离αc代替分散性尺寸γ是可行的(也可用均方旋转半径R2g代替).文中给出了PA6/PP合金的弥散层厚度d和界面层厚度σb的计算结果,同时给出了HIPS/PcBR合金在熔体动态过程中两相间弥散层厚度的变化.“,”Light scattering theory was developed for the semi-compatible blend system. A new parameter - the transition layer thickness (d) - was introduced to describe the compatibility of the system in both the static and the dynamic states. d was shown to be a function of the integral invariant (Q), the size of the dispersed phase(r), and the volume fractions of each component(ψ1, ψ2 respectively). Using the correlation distance, ac, instead of r (since both are indicative of the dimension of the dispersed phase pellets), d was calculated for the PA6/PP system using both the Small Angle Light Scattering(SALS) method and the Small Angle X-ray Scattering (SAXS) technique. The calculated d was compared with σb, the interface layer thickness which is a widely used parameter calculated from SAXS. The result shows that the transition layer thickness is indeed a valid parameter to describe compatibility. ψ3, the volume fraction of the transition layer, was also calculated in this paper.Both d and ψ3 can be used in discussing changes in compatible behavior during mixing.