Small Angle Neutron Scattering From Viscoelastic Polymer-Clay Solutions
Small Angle Neutron Scattering From Viscoelastic Polymer-Clay Solutions
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DOI：
10.1021/ma0115141
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发表时间：
2002-05
期刊：
影响因子：
5.5
通讯作者：
G. Schmidt;A. Nakatani;P. Butler;C. Han
中科院分区：
文献类型：
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作者：
G. Schmidt;A. Nakatani;P. Butler;C. Han
通过剪切下的小角中子散射（SANS）研究了剪切对粘弹性聚合物粘土溶液的影响。 SANS 用于测量聚合物和片晶的剪切诱导取向。随着剪切速率的增加，形成各向异性散射图案。在较高的剪切速率下，由于剪切场中粘土片晶的取向增强，散射各向异性增加。粘土片晶按不寻常的方向流动排列，表面法线平行于涡度方向。 SANS 对常规样品（D2O 和溶液成分之间的对比）测量了聚合物和血小板的剪切诱导取向。然而，通过对比匹配，可以单独检测到聚合物的取向。随着剪切速率的增加，粘土颗粒首先定向（常规样品上的 SANS），然后聚合物链开始拉伸（对比匹配样品上的 SANS）。剪切的停止导致快速恢复，证明该系统是高效的...
The influence of shear on viscoelastic polymer−clay solutions was investigated by means of small-angle neutron scattering (SANS) under shear. SANS was used to measure the shear-induced orientation of polymer and platelets. With increasing shear rate an anisotropic scattering pattern developed. At higher shear rates, the scattering anisotropy increased due to the enhanced orientation of the clay platelets in the shear field. The clay platelets aligned by the flow in an unusual direction, with the surface normal parallel to the vorticity direction. SANS on regular samples (contrast between D2O and solution components) measured the shear-induced orientation of polymer and platelets. However, with contrast matching the orientation of the polymer alone could be detected. With increasing shear rate, clay particles oriented first (SANS on regular samples) and then polymer chains started to stretch (SANS on contrast matched samples). Cessation of shear led to fast recovery, demonstrating the system to be highly e...