The dewetting dynamics of a supported bilayer polymer thin film on a solid substrate is investigated using grazing incidence x-ray photon correlation spectroscopy. We find that the top layer dewets via the spinodal mechanism. The kinetics of the dewetting is studied by monitoring the time evolution of the surface diffuse x-ray scattering intensity. We study the time evolution of fluctuations about the average surface structure by measuring the two-time x-ray intensity fluctuation correlation functions. Using these two-time correlation functions we quantify the crossover from early-time diffusive dynamics to hydrodynamics. The early diffusive regime satisfies dynamic universality. The two-time correlation functions also quantify the onset of hydrodynamic effects. The hydrodynamic regime is observed during the spinodal dewetting process as these interactions are not screened.

中文翻译：

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聚合物-聚合物薄膜旋节线去湿动力学过程中粗化的普遍动力学

使用掠入射x射线光子相关光谱法研究了固体基材上负载的双层聚合物薄膜的去湿动力学。我们发现顶层通过旋节线机制进行润湿。通过监测表面扩散x射线散射强度的时间演变来研究去湿的动力学。我们通过测量两次x射线强度波动相关函数来研究关于平均表面结构的波动的时间演化。使用这些两次相关函数，我们可以量化从早期扩散动力学到流体动力学的交叉。早期的扩散体制满足动态普遍性。二次相关函数还可以量化流体动力效应的发生。