Enhanced viscoelasticity of polyalphaolefins confined and sheared in submicron-to-nanometer-sized gap range and its dependence on shear rate and temperature
Enhanced viscoelasticity of polyalphaolefins confined and sheared in submicron-to-nanometer-sized gap range and its dependence on shear rate and temperature
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DOI：
10.1016/j.triboint.2017.12.022
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发表时间：
2017-12
影响因子：
6.2
通讯作者：
S. Itoh;Yuya Ohta;K. Fukuzawa;Hedong Zhang
中科院分区：
文献类型：
--
作者：
S. Itoh;Yuya Ohta;K. Fukuzawa;Hedong Zhang
测量了在亚微米到纳米尺寸的间隙范围内限制和剪切的聚α烯烃的粘弹性。在此间隙范围内观察到从本体粘度到受限粘弹性的连续转变。当间隙小于100nm左右时，粘度增加，而当间隙小于10nm时，弹性迅速增加。还在约束状态下测量了独特粘弹性的剪切速率和温度依赖性。随着剪切速率和温度的增加，增强的粘度降低。这些发现有望提高对窄间隙流体动力润滑设计的基本理解。
The viscoelasticity of polyalphaolefins confined and sheared in a submicron-to-nanometer-sized gap range was measured. A continuous transition from bulk viscosity to confined viscoelasticity was observed in this gap range. The viscosity increased when the gap was less than around 100 nm, whereas the elasticity rapidly increased when the gap was less than 10 nm. The shear rate and temperature dependence of the unique viscoelasticity was also measured in the confined state. The enhanced viscosity decreased as the shear rate and the temperature increased. These findings are expected to improve the basic understanding of hydrodynamic lubrication design in narrow gaps widths.