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Friction of Polymers: from PDMS Melts to PDMS Elastomers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acsmacrolett.7b00842 Marceau Hénot 1 , Éric Drockenmuller 2 , Liliane Léger 1 , Frédéric Restagno 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acsmacrolett.7b00842 Marceau Hénot 1 , Éric Drockenmuller 2 , Liliane Léger 1 , Frédéric Restagno 1
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The slip behavior of polydimethylsiloxane (PDMS) polymer melts flowing on weakly adsorbing surfaces made of short nonentangled PDMS chains densely end-grafted to silica has been characterized. For high enough shear rates, slip lengths proportional to the bulk fluid viscosity have been observed, in agreement with Navier’s interfacial equation and demonstrating that the interfacial Navier’s friction coefficient is a local quantity, independent of the polymer molecular weight. Comparing the interfacial shear stresses deduced from these measured slip lengths to available friction stress measured for cross-linked PDMS elastomers, we further demonstrate the local character of the friction coefficient and compare its value to the monomer–monomer friction.
中文翻译：
聚合物的摩擦：从 PDMS 熔体到 PDMS 弹性体
聚二甲基硅氧烷 (PDMS) 聚合物熔体在由短的非缠结 PDMS 链密集末端接枝到二氧化硅制成的弱吸附表面上流动的滑移行为已被表征。对于足够高的剪切速率，已观察到与整体流体粘度成比例的滑移长度，这与 Navier 界面方程一致，并证明界面 Navier 摩擦系数是一个局部量，与聚合物分子量无关。将从这些测量的滑动长度推导出的界面剪切应力与为交联的 PDMS 弹性体测量的可用摩擦应力进行比较，我们进一步证明了摩擦系数的局部特征，并将其值与单体-单体摩擦进行了比较。
更新日期：2018-01-04
中文翻译：
聚合物的摩擦：从 PDMS 熔体到 PDMS 弹性体
聚二甲基硅氧烷 (PDMS) 聚合物熔体在由短的非缠结 PDMS 链密集末端接枝到二氧化硅制成的弱吸附表面上流动的滑移行为已被表征。对于足够高的剪切速率，已观察到与整体流体粘度成比例的滑移长度，这与 Navier 界面方程一致，并证明界面 Navier 摩擦系数是一个局部量，与聚合物分子量无关。将从这些测量的滑动长度推导出的界面剪切应力与为交联的 PDMS 弹性体测量的可用摩擦应力进行比较，我们进一步证明了摩擦系数的局部特征，并将其值与单体-单体摩擦进行了比较。
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