Surface and mechanical properties of hydrophobic silica contained hybrid films of waterborne polyurethane and fluorinated polymethacrylate |
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| Authors: | Zhaofeng Wu Hua Wang Xingyou Tian Meng Xue Xin Ding Xianzhu Ye Zhongyue Cui |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China;2. Institute of Environmental Engineering, ETH Zurich, CH-8093 Zurich, Switzerland |
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| Abstract: | The surface and mechanical properties of hybrid films of waterborne polyurethane (WPU) and fluorinated polymethacrylate (FPMA), and high-hydrophobic silica (SiO2) contained hybrid films of FPMA/WPU were investigated. X-ray photoelectron spectroscopy confirmed that the surfaces of hybrid films exhibited notable fluorine enrichment. Scanning electron microscopy observation demonstrated that micro-scale rough structures consisted of sub-micro papillae and micro-scale wrinkles formed on the surfaces of FPMA/WPU. This was attributed to the enhanced phase separation of WPU and the incompatibility of low-surface-energy FPMA and WPU. Colloidal SiO2 was modified by polydimethylsiloxane and the modified SiO2 was reactive and high-hydrophobic. After the addition of reactive SiO2, the rough structures became micro-scale striped wrinkles studded with nano- and sub-micro papillae formed by the high-hydrophobic SiO2. The combination of the fluorine enrichment and the rough structures accounted for the high hydrophobic FPMA/WPU film and superhydrophobic SiO2/FPMA/WPU film. |
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| Keywords: | Waterborne polyurethane Phase separation Rough structures hydrophobicity |
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