Hénot Marceau, Drockenmuller Eric, Léger Liliane, Restagno Frédéric
Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France.
Univ Lyon, Université Lyon 1, CNRS, Ingénierie des Matériaux Polymères, UMR 5223, F-69003, Lyon, France.
Eur Phys J E Soft Matter. 2018 Jul 9;41(7):83. doi: 10.1140/epje/i2018-11697-4.
The evolution over time of the nonlinear slip behavior of a polydimethylsiloxane (PDMS) polymer melt on a weakly adsorbing surface made of short non-entangled PDMS chains densely end-grafted to the surface of a fused silica prism has been measured. The critical shear rate at which the melt enters the nonlinear slip regime has been shown to increase with time. The adsorption kinetics of the melt on the same surface has been determined independently using ellipsometry. We show that the evolution of slip can be explained by the slow adsorption of melt chains using the Brochard-de Gennes's model.
已测量了聚二甲基硅氧烷（PDMS）聚合物熔体在由短的非缠结PDMS链密集端接枝到熔融石英棱镜表面制成的弱吸附表面上的非线性滑移行为随时间的演变。已表明熔体进入非线性滑移状态时的临界剪切速率随时间增加。已使用椭偏仪独立测定了熔体在同一表面上的吸附动力学。我们表明，使用布罗沙尔-德热纳模型，滑移的演变可以通过熔体链的缓慢吸附来解释。
