Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China.
Phys Chem Chem Phys. 2014 Apr 14;16(14):6787-94. doi: 10.1039/c3cp54429j. Epub 2014 Mar 5.
The effects of polydimethylsiloxane (PDMS) on phase separation, optical transmittance and surface properties including surface composition, morphology and wettability of waterborne polyurethane (WPU) containing PDMS were investigated. After the introduction of PDMS into the WPU backbone by polymerization, the large difference in the solubility parameter of the non-polar PDMS segment and the high-polar urethane segments promoted PDMS enrichment at the air-polymer interface and enhanced phase separation, resulting in rough structures. Accordingly, the combination of PDMS enrichment and the rough structures contributed to the high or superhydrophobic surfaces and the highest contact angle with water achieved was 156.5°. The optical transmittance of the highly hydrophobic coatings reached about 78-87% throughout most of the visible light region. Importantly, the highly hydrophobic and transparent properties will greatly broaden the applications of WPU, showing potential for the environmental protection and industrial applications.
研究了聚二甲基硅氧烷（PDMS）对相分离、透光率以及包括表面组成、形貌和润湿性在内的表面性能的影响，该 PDMS 存在于含有 PDMS 的水性聚氨酯（WPU）中。通过聚合将 PDMS 引入 WPU 主链后，非极性 PDMS 段和高极性氨酯段之间溶解度参数的巨大差异促进了 PDMS 在空气-聚合物界面处的富集，从而增强了相分离，导致粗糙结构的形成。因此，PDMS 富集和粗糙结构的结合促成了高或超疏水表面，实现的最大水接触角达到 156.5°。高疏水性涂层的透光率在可见光区域的大部分范围内达到约 78-87%。重要的是，高疏水性和高透明性将极大地拓宽 WPU 的应用范围，显示出在环境保护和工业应用方面的潜力。
