Thermoresponsive Melamine Sponges with Switchable Wettability by Interface-Initiated Atom Transfer Radical Polymerization for Oil/Water Separation
Thermoresponsive Melamine Sponges with Switchable Wettability by Interface-Initiated Atom Transfer Radical Polymerization for Oil/Water Separation
复制标题
通过界面引发原子转移自由基聚合可切换润湿性的热响应三聚氰胺海绵用于油/水分离
DOI：
10.1021/acsami.6b14565
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发表时间：
2017-03-15
影响因子：
9.5
通讯作者：
Wang, Chaoyang
中科院分区：
文献类型：
--
作者：
Lei, Zhiwen;Zhang, Guangzhao;Wang, Chaoyang
本文通过将十八烷基三氯硅烷和温敏性聚（N-异丙基丙烯酰胺）（PNIPAAm）接枝到三聚氰胺海绵骨架表面，得到了一种在超亲水性和超疏水性之间润湿性可控的温敏性三聚氰胺海绵。整个过程包括硅烷化和原子转移自由基聚合两个步骤，硅烷化提供低表面能的粗糙表面和NH 2，原子转移自由基聚合确保PNIPAAm成功接枝到骨架表面。通过改变PNIPAAm的下临界溶解温度（LCST，约32 ℃）以下或以上的温度，该产品表现出良好的超亲水性和超疏水性之间的可逆切换，并且改性海绵在经历两次温度切换20次循环后仍然保持良好的响应性。同时，功能化海绵可用于在37 ° C下在水中吸收油，并且它们在20 ° C下以各种方式释放所吸收的油，显示出分离。
Here we have obtained a temperature responsive melamine sponge with a controllable wettability between superhydrophilicity and superhydrophobicity by grafting the octadecyltrichlorosilane and thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) onto the surface of melamine sponge skeletons. The whole process included the silanization in which step the rough surface with low surface energy and the NH2 were provided, and the atom transfer radical polymerization which ensured the successful grafting of PNIPAAm onto the skeleton's surface. The product exhibits a good reversible switch between superhydrophilicity and super hydrophobicity by changing the temperature below or above the lower critical solution temperature (LCST, about 32 degrees C) of PNIPAAm, and the modified sponge still retains a good responsiveness after undergoing two temperature switches for 20 cycles. Simultaneously, the functionalized sponges could be used to absorb the oil under water at 37 degrees C, and they released the absorbed oil in various ways under water at 20 degrees C, showing separation.