Fang Zheng, Zhang Junfeng, Yan Xuefeng, Hu Lizhen, Lei Lin, Fan Huiqing, Wang Weijia, Müller-Buschbaum Peter, Zhong Qi
Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 928 Second Avenue, 310018 Hangzhou, China.
Hexin Kuraray Micro Fiber Leather (Jiaxing) Co. Ltd., 777 Pingnan Road, 314003 Jiaxing, China.
ACS Appl Mater Interfaces. 2022 Apr 13;14(14):16641-16648. doi: 10.1021/acsami.2c01042. Epub 2022 Apr 4.
The simultaneous and efficient removal of oleophilic and hydrophilic stains from polyurethane (PU) is realized by combining the easy-cleaning from the hydrophilic thermoresponsive hydrogel coating containing acrylamide (AAm), gum arabic (GA), and (ethylene glycol) methyl ether methacrylate (OEGMA) P(GA/AAm/OEGMA) and the self-cleaning from the embedded nonmetallic photocatalyst g-CN. Due to the existence of strong hydrogen bonds between the hydroxyl groups in the hybrid hydrogel coating and the hydroxyl/carboxyl groups in the plasma-treated PU, the hybrid hydrogel coating is very stable on PU. Simultaneously, the acrylamide network in the hybrid hydrogel coating enhances its mechanical strength. Because the transition temperature of OEGMA is well above the room temperature, the cross-linked coating remains hydrophilic in ambient conditions. Thus, oleophilic stains, such as oil and grease, can be easily removed from the coating surface. In addition, the embedded photocatalyst g-CN in the hybrid hydrogel coating introduces the extra capability of decomposing organic compounds under sunshine, which favors the removal of hydrophilic stains such as dyes and wines. After sunlight illumination and simply rinsing with water, both hydrophilic and oleophilic stains can be easily removed. Moreover, this joint cleaning performance can work for a long time. Even after four consecutive cycles, both the easy-cleaning to oleophilic stains by the hydrophilic hydrogel surface and self-cleaning to the hydrophilic stains by the embedded g-CN remain unchanged.
通过将含有丙烯酰胺（AAm）、阿拉伯胶（GA）和（乙二醇）甲基丙烯酸甲酯（OEGMA）的亲水性热响应水凝胶涂层P（GA/AAm/OEGMA）的易清洁性与嵌入的非金属光催化剂g-CN的自清洁性相结合，实现了从聚氨酯（PU）上同时高效去除亲油性和亲水性污渍。由于杂化水凝胶涂层中的羟基与等离子体处理的PU中的羟基/羧基之间存在强氢键，杂化水凝胶涂层在PU上非常稳定。同时，杂化水凝胶涂层中的丙烯酰胺网络增强了其机械强度。由于OEGMA的转变温度远高于室温，交联涂层在环境条件下保持亲水性。因此，亲油性污渍，如油脂，可以很容易地从涂层表面去除。此外，杂化水凝胶涂层中嵌入的光催化剂g-CN引入了在阳光下分解有机化合物的额外能力，这有利于去除亲水性污渍，如染料和葡萄酒。经过阳光照射和简单水洗后，亲水性和亲油性污渍都可以很容易地去除。而且，这种联合清洁性能可以长期发挥作用。即使经过四个连续循环，亲水性水凝胶表面对亲油性污渍的易清洁性和嵌入的g-CN对亲水性污渍的自清洁性都保持不变。
