Polymer thin films with micro/nano-structures can be prepared by a solvent evaporation induced phase separation process via spin-casting a polymer blend, where the elongated phase separation domains are always inevitable. The striation defect, as a thickness nonunifomity in spin-cast films, is generally coexistent with the elongated domains. Herein, the morphologies of polymer blend thin films are recorded from the spin-cast center to the edge in a panoramic view. The elongated domains are inclined to appear at the ridge regions of striations with increasing radial distance and align radially, exhibiting a coupling between the phase separation morphology and the striation defect that may exist. We demonstrate that the formation of elongated domains is not attributed to shape deformation, but is accomplished in situ. A possible model to describe the initiation and evolution of the polymer blend phase separation morphology during spin-casting is proposed.

中文翻译：

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使用全景图像表征的旋涂聚合物共混薄膜中的伸长相分离域†

具有微/纳米结构的聚合物薄膜可以通过溶剂蒸发诱导的相分离工艺，通过旋铸聚合物共混物来制备，其中拉长的相分离域始终是不可避免的。在旋转浇铸膜中作为厚度不均匀的条纹缺陷通常与细长区域共存。在此，从旋转浇铸中心到边缘以全景视图记录聚合物共混物薄膜的形态。随着径向距离的增加，细长区域倾向于出现在条纹的脊状区域并径向对齐，从而表现出相分离形态与可能存在的条纹缺陷之间的耦合。我们证明拉长的域的形成不是归因于形状变形，而是完成的原地。提出了一个可能的模型来描述自旋铸造过程中聚合物共混物相分离形态的发生和演化。