纠缠诱导滑移对液体前沿分布的影响
Liquid Front Profiles Affected by Entanglement-induced Slippage
摘要:
流体动力学滑移起着至关重要的作用,在薄聚合物膜的流动动力学,最近所示的分析的轮廓的液体前锋。对于长链聚合物膜,据报道,偏离对称分布是粘弹性效应的结果。然而,在这封信中,给出的证据表明,仅仅在固/液界面处的滑移边界条件可以导致不对称的轮廓。缠结的聚合物熔体在不同的基板上的去湿实验允许边缘形态的直接比较。分子量Mw的变化清楚地表明,在一定的Mw以上,滑移急剧增加,并控制边缘的形状。结果与de Gennes的理论描述一致。
英文摘要:
Hydrodynamic slippage plays a crucial role in the flow dynamics of thin polymer films, as recently shown by the analysis of the profiles of liquid fronts. For long-chained polymer films it was reported that a deviation from a symmetric profile is a result of viscoelastic effects. In this Letter, however, evidence is given that merely a slip boundary condition at the solid/liquid interface can lead to an asymmetric profile. Dewetting experiments of entangled polymer melts on diverse substrates allow a direct comparison of rim morphologies. Variation of molecular weight Mw clearly reveals that slippage increases dramatically above a certain Mw and governs the shape of the rim. The results are in accordance with the theoretical description by de Gennes.
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