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利用激光小角背散射法对不相容聚合物体系聚苯乙烯／顺丁橡胶（ＰＳ／ＰｃＢＲ）共混过程中结构变化进行了在线分析。分散相颗粒尺寸由Ｄｅｂｙｅ散射理论中相关距离（αｃ）及平均直径（Ｄ描述）。由相关距离随组成比变化显示，在ＰＳ／ＰｃＢＲ共混质量比为５０／５０时出现相反转，即当ＰＳ含量小于５０％时ＰＳ为分散相，当ＰＳ含量大于５０％时ＰＳ为连续相，ＰＳ含量为５０％时体系为双连续相。分散相平均直径随共混时间延长而降低，其变化过程满足颗粒粉碎理论：ｄｔ＝－ｂＤ－ｎｄＤ，系数ｎ和ｂ与共混条件、共混材料特征及共混物两相含量等有关。共混物经不同共混时间后试样由扫描电子显微镜分析结果与激光小角背散射分析结果一致。
The structural changes of PS / PcBR blends were analyzed online by laser small backscattering. Dispersed phase particle size is determined by the relative distance (αc) and average diameter (D) described in the Debye scattering theory. The dependence of the relative distance on the composition ratio shows that the phase inversion occurs when the mass ratio of PS / PcBR is 50/50, that is, the PS is the disperse phase when the PS content is less than 50%, and the PS is the continuous phase when the PS content is greater than 50% , When the content of PS is 50%, the system is bicontinuous phase. The average diameter of disperse phase decreases with the blending time, and its changing process meets the theory of particle crushing: dt = -bD-ndD. The coefficients n and b are related to the blending conditions, the characteristics of the blended material and the two-phase content of the blend. After different blending time, the samples were analyzed by scanning electron microscope (SEM) and the results were consistent with the results of laser backscattering.