Evidence of shear-induced fluid fracture in telechelic polymer networks -: art. no. 048303
Evidence of shear-induced fluid fracture in telechelic polymer networks -: art. no. 048303
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DOI：
10.1103/physrevlett.87.048303
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发表时间：
2001-07-23
影响因子：
8.6
通讯作者：
Séréro, Y
中科院分区：
文献类型：
--
作者：
Berret, JF;Séréro, Y
采用流变学和流动显示技术研究了遥爪聚合物网络的剪切流动特性。稳态剪切粘度-剪切速率曲线显示出由不连续性分开的两个主要分支。流动曲线的一个分支是牛顿和剪切增稠，而第二个分支是剪切变稀。以上的不连续性，剪切诱导流体破裂类似于那些报告的脆性固体和在起源的非均匀流。然而，由于聚合物网络的有限弛豫时间，与普通凝胶相反，可以可逆地产生和愈合断裂。
The shear-flow properties of telechelic polymer networks have been investigated by rheology and flow-visualization techniques. The steady-shear viscosity versus shear-rate curves exhibits two main branches separated by a discontinuity. One branch of the flow curve is Newtonian and shear thickening, whereas the second one is sheer thinning. Above the discontinuity, shear induces a fluid fracture similar to those reported for brittle solids and at the origin of an inhomogeneous flow. Because of the finite relaxation time of the polymer network however, and contrary to ordinary gels, the fracture can be created and healed reversibly.