Thermoresponsive Polyurethane Sponges with Temperature-Controlled Superwettability for Oil/Water Separation,ACS Applied Polymer Materials

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Thermoresponsive Polyurethane Sponges with Temperature-Controlled Superwettability for Oil/Water Separation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsapm.9b01159
Peng Yi ₁ , Huawen Hu ₂ , Weiwei Sui ₁ , Haichen Zhang ₂ , Yinlei Lin ₂ , Guangji Li ₁

Affiliation

Here we have obtained a thermoresponsive three-dimensional (3D) polyurethane (PU) sponge with temperature-controlled superwettability. First, silanization was used to enhance the surface roughness of the PU sponge and reactive vinyl groups were provided. We then grafted a polyisopropylacrylamide (PNIPAAm) hydrogel to the PU skeleton, resulting in the preparation of a temperature-responsive 3D PU material showing useful oil–water separation performance. The surface morphology, chemical composition, and wettability of the prepared modified PU sponge were clarified. The surface wettability of the modified sponge changed with temperature. Under ambient conditions with a temperature of 25 °C, which is lower than the low critical solution temperature of PNIPAAm (LCST, about 32 °C), the product showed superhydrophilicity in air and superoleophobicity under water, while when the outside temperature (45 °C) became higher than the LCST, the product changed to show high hydrophobicity in air and superlipophilicity under water. After 8 cycles of temperature variation, the product still showed impressive responsiveness. In addition to the smart responsive properties, the modified PU sponge could absorb and automatically desorb oil at 45 and 20 °C, respectively, showing good oil–water separation ability, together with the capability of oil recycling.

中文翻译：

具有温度控制的超润湿性的热敏性聚氨酯海绵，用于油/水分离

在这里，我们获得了具有温度控制的超湿性的热响应三维（3D）聚氨酯（PU）海绵。首先，使用硅烷化来增强PU海绵的表面粗糙度，并提供反应性乙烯基。然后，我们将聚异丙基丙烯酰胺（PNIPAAm）水凝胶接枝到PU骨架上，从而制备出具有温度响应性的3D PU材料，该材料显示出有用的油水分离性能。澄清了所制备的改性PU海绵的表面形态，化学组成和润湿性。改性海绵的表面润湿性随温度变化。在25°C的环境条件下，该温度低于PNIPAAm的低临界溶液温度（LCST，约32°C），该产品在空气中显示出超亲水性，在水下具有超疏油性，而当外界温度（45°C）高于LCST时，该产品发生变化，显示出在空气中的高疏水性和在水下的超亲脂性。经过8个温度变化循环后，产品仍显示出令人印象深刻的响应能力。除了具有灵敏的响应特性外，改性的PU海绵还可以分别在45和20°C时吸收并自动解吸油，显示出良好的油水分离能力以及回油能力。

更新日期：2020-03-30

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