“Butterfly” Light Scattering Pattern in Shear-Enhanced Concentration Fluctuations in Polymer Solutions and Anomaly at High Shear Rates
“Butterfly” Light Scattering Pattern in Shear-Enhanced Concentration Fluctuations in Polymer Solutions and Anomaly at High Shear Rates
复制标题
聚合物溶液剪切增强浓度波动中的“蝴蝶”光散射模式和高剪切速率下的异常
DOI：
10.1143/jpsj.61.1839
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发表时间：
1992
影响因子：
1.7
通讯作者：
Takuji Kume
中科院分区：
文献类型：
--
作者：
T. Hashimoto;Takuji Kume
用流动光散射法研究了简单剪切流对高分子量聚苯乙烯半稀溶液浓度波动的影响。散射的剪切速率（\（\dot{\gamma}\））依赖性被发现分为四个区域：区域I在\（\dot{\gamma} \dot{\gamma}_{c}\），\（\dot{\gamma}_{c}\）是剪切增强浓度波动的临界剪切速率。在制度II，一个独特的蝴蝶型散射图案与垂直于流动方向的暗条纹出现。平行于流动的强度随着\（\dot{\gamma}\）的增加而增加约100倍。在较高剪切速率下的区域III中，强度随着\（\dot{\gamma}\）的增加而趋于饱和，最终在更高剪切速率下的区域IV中，强度进一步增加，蝴蝶图案变成两点图案长..
The effects of simple shear flow on concentration fluctuations in semidilute solutions of high molecular weight polystyrene are investigated by the flow light scattering method. The shear-rate (\(\dot{\gamma}\) ) dependence of scattering was found to fall into four regimes: Regime I at \(\dot{\gamma} \dot{\gamma}_{c}\), \(\dot{\gamma}_{c}\) being the critical shear rate for the shear-enhanced concentration fluctuations. In Regime II, a unique butterfly-type scattering pattern with a dark streak perpendicular to the flow direction appears. The intensity parallel to the flow increases by about 100 times with increasing \(\dot{\gamma}\) . In Regime III at higher shear rates, the intensity increase with \(\dot{\gamma}\) tends to saturate, and finally in Regime IV at even higher shear rates, the intensity further increases and the butterfly pattern changes into a two-point pattern elong...