Shear-induced mesostructure in nanoplatelet-polymer networks
Shear-induced mesostructure in nanoplatelet-polymer networks
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DOI：
10.1063/1.1609972
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发表时间：
2003-10
影响因子：
4.4
通讯作者：
S. Lin‐Gibson;G. Schmidt;Hongdoo Kim;C. Han;E. Hobbie
中科院分区：
文献类型：
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作者：
S. Lin‐Gibson;G. Schmidt;Hongdoo Kim;C. Han;E. Hobbie
采用小角中子、光散射、光学显微镜和流变学等方法对聚合物-粘土凝胶模型的剪切响应进行了测量。由于流动破坏了粘土和聚合物之间形成的瞬态网络，成分和应力之间的耦合导致宏观区域模式的形成，而粘土薄片的表面法线方向与涡度方向平行。我们讨论了在其他复杂流体中观察到的剪切引起的结构转变的相似性，并为粘土血小板的取向提供了物理解释。
The shear response of a model polymer–clay gel is measured using small-angle neutron and light scattering, optical microscopy, and rheometry. As the flow disrupts the transient network that forms between clay and polymer, coupling between composition and stress leads to the formation of a macroscopic domain pattern, while the clay platelets orient with their surface normal parallel to the direction of vorticity. We discuss similarities with shear-induced structural transitions observed in other complex fluids, and we offer a physical explanation for the orientation of the clay platelets.