The shear rheology of thin compressed liquid films
The shear rheology of thin compressed liquid films
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压缩液膜的剪切流变学
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Bair
中科院分区：
文献类型：
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作者：
S. Bair
摘要 高压下的薄液膜具有独特的性质。可以在稳定剪切下产生足够高的剪切应力，而不会遇到热软化极限或界面滑移，在低分子量液体中可以观察到通常被认为是高聚物保留的各种非牛顿效应。这些包括剪切稀化、粘弹性和内聚破坏。回顾了相关流变学文献。这里仅讨论连续体的属性，忽略近表面效应。特别是在过去的十年中，实验和分子模拟都表明，当考虑到低分子量液体的弛豫时间要短得多时，润滑剂和液体聚合物之间可以进行许多类比。剪切稀化、弹性和液体破坏是低分子量液体薄膜在高压下剪切响应的所有方面。
Abstract Thin liquid films at elevated pressures have a unique property. A sufficiently high shear stress can be generated in steady shear without encountering the thermal softening limit or interfacial slip that it is possible to observe, in low molecular weight liquids, various non-Newtonian effects ordinarily thought to be reserved for high polymers. These include shear thinning, viscoelasticity and cohesive failure. The relevant rheology literature is reviewed. Only the properties of the continuum are addressed here, omitting near-surface effects. Within the last 10 years in particular, both experiment and molecular simulation have shown that many analogies may be made between lubricants and liquid polymers when allowance is made for the much shorter relaxation time of the low molecular weight liquid. Shear thinning, elasticity and liquid failure are all aspects of the shear response of thin films of low molecular weight liquids at elevated pressures.