Polymer ( IF 4.6 ) Pub Date : 2017-09-11 , DOI: 10.1016/j.polymer.2017.09.020 Iman Hejazi , Javad Seyfi , Gity Mir Mohamad Sadeghi , Seyed Hassan Jafari , Hossein Ali Khonakdar , Astrid Drechsler , Seyed Mohammad Davachi
A one-step and efficient method, based on the spray-coating technique, was proposed to impart superhydrophobicity to an intrinsically hydrophilic polymer. The main aim is to establish correlations among surface morphology, topography and chemical composition of superhydrophobic surfaces. Introduction of non-solvent changed the ordered honeycomb-like morphology to an unordered strand-like morphology. Moreover, the concurrent addition of non-solvent and nanoparticles has led to a unique hierarchical morphology where silica nanoparticles decorated the PU strand-like structure resulting in a very high WCA value (160°) and very low sliding angle (<2°). The topography results were utterly in conformity with those attained by the morphological analysis, and both qualitative and quantitative descriptions were given. It was found that the uniformity of the roughened structure plays a crucial role in superhydrophobicity. Moreover, the aggregation of silica particles at the surface layer of the coatings was also influential which was further confirmed by X-ray photoelectron spectroscopy results.
中文翻译:
研究喷涂聚氨酯/二氧化硅纳米复合材料中超疏水性与表面形态,形貌和化学组成的相互关系
提出了一种基于喷涂技术的一步有效的方法,以赋予固有亲水性聚合物超疏水性。主要目的是建立超疏水表面的表面形态,形貌与化学组成之间的相关性。非溶剂的引入将有序的蜂窝状形态改变为无序的股状形态。此外,同时添加非溶剂和纳米粒子已导致独特的分层形态,其中二氧化硅纳米粒子装饰了PU链状结构,从而导致非常高的WCA值(160°)和非常低的滑动角(<2°)。地形结果与形态分析结果完全一致,并给出了定性和定量的描述。发现粗糙结构的均匀性在超疏水性中起关键作用。此外,二氧化硅颗粒在涂层表面层的聚集也有影响,这通过X射线光电子能谱结果进一步证实。