Polyurethane (PU) has been extensively used in multiple technologically critical applications because of its favorable physicochemical characteristics. The aim of this study is the development of patterned PU films by adopting an alkaline hydrolysis approach. This process generates amine functionality and microdomains on the PU surface. The surface functionality is investigated using various characterization techniques, such as amine content, contact angle, Fourier transform infrared spectroscopy. The inherent mechanical strength of PU films diminishes significantly with the hydrolysis time. The hydrophilicity on the surface is observed in terms of a decrease in the contact angle with respect to the pristine PU. The hydrolysis leads to a significant alteration in the surface morphology. The alkaline hydrolysis creates the valley and trough pattern on the surface of the PU matrix, which is confirmed using SEM and 3D profilometer.

Graphic abstract

中文翻译：

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聚氨酯薄膜水解功能化过程中的表面特征和构图

聚氨酯（PU）由于其良好的物理化学特性，已广泛用于多种技术关键的应用中。这项研究的目的是通过采用碱性水解方法来开发图案化的PU膜。该过程在PU表面上产生胺官能度和微区。使用各种表征技术研究表面功能，例如胺含量，接触角，傅立叶变换红外光谱。PU膜的固有机械强度随着水解时间而显着降低。通过相对于原始PU的接触角的减小来观察表面上的亲水性。水解导致表面形态的显着改变。

图形摘要