将挥发性polymer溶液弯月面的单调和振荡运动与polymer线圈和沉积物形态的输运联系起来
Connecting monotonic and oscillatory motions of the meniscus of a volatile polymer solution to the transport of polymer coils and deposit morphology
摘要：
我们研究的聚合物沉积图案之间的连接出现以下的聚甲基丙烯酸甲酯（PMMA）在甲苯中的溶液的蒸发，在溶液中的聚合物线圈的运输，和溶液的弯月面的运动。当改变溶质的分子质量和初始浓度以及温度时，观察到不同的沉积模式，并以形态相图的形式系统地呈现。沉积模式与弯月面运动有一定的相关性。它们随溶液中聚合物线圈的蒸发驱动的对流通量和扩散通量之间的比率而变化。在扩散主导的溶质传输的情况下，溶液通过蒸发单调地使固体基底去湿，支持连续的接触线运动和连续的聚合物沉积。然而，一个对流为主的运输结果在一个振荡棘轮脱湿-润湿运动的接触线与更明显的脱湿阶段。然后，沉积过程是周期性的，并产生条纹图案。的弯月面的振荡运动不同于良好记录的粘滑运动的弯月面，观察到，以及，是由于蒸发和马兰戈尼应力，交替主导沉积过程的相反的影响。
英文摘要：
We study the connection between the polymer deposition patterns to appear following the evaporation of a solution of poly-methyl-methacrylate (PMMA) in toluene, the transport of the polymer coils in the solution, and the motion of the meniscus of the solution. Different deposition patterns are observed when varying the molecular mass and initial concentration of the solute and temperature and are systematically presented in the form of morphological phase diagrams. The modi of deposition and meniscus motion are correlated. They vary with the ratio between the evaporation-driven convective flux and diffusive flux of the polymer coils in the solution. In the case of a diffusion-dominated solute transport, the solution monotonically dewets the solid substrate by evaporation, supporting continuous contact line motion and continuous polymer deposition. However, a convection-dominated transport results in an oscillatory ratcheting dewetting-wetting motion of the contact line with more pronounced dewetting phases. The deposition process is then periodic and produces a stripe pattern. The oscillatory motion of the meniscus differs from the well documented stick-slip motion of the meniscus, observed as well, and is attributed to the opposing influences of evaporation and Marangoni stresses, which alternately dominate the deposition process.
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