聚合物共混过程中的小角激光光散射在线分析(英文)

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。

On line Analysis of Polymer Blending by Small Angle Laser Light Scattering

The on line analysis on morphology has been completed for immiscible polymer blends during the processing. A trpical polymer/polymer system, polystyrene/poly(cis butadiene) rubber is used. The blends are subjected to small angle laser back scattering. The correlation distance varies with the increase of dispersed phase component, and the blends exists phase reversion at the 50/50 weight ratio of polystyrene/poly(cis butadiene) ruber. The size reduction of the dispersed phase during processing is calculated. The result indicates that the mean diameter of dispersed particles reduces with processing time, which follows the comminution theory: dt=-b -n d . The breakup coefficients n and b are used to reflect the effect of processing. It was found that the breakup coefficients depend on the processing condition, the component of dispersed phase and the property of the processing polymers. The higher the mixing speed reduces the size of dispersed phase faster, hence the breakup coeficients become less.