Facile generation of highly durable thiol-functionalized polyhedral oligomeric silsesquioxane based superhydrophobic melamine foam

Abstract

In this study, a durable superhydrophobic/superoleophilic melamine foam was fabricated by a facile and rapid one-step thiol-ene click chemistry and Michael addition reaction, which demonstrated excellent robustness in oil/water separation. First, 1H, 1H, 2H-perfluoro-1-hexene reacted with thiol-functionalized polyhedral oligomeric silsesquioxane via the thiol-ene click chemistry to obtain a fluorinated thiol-functionalized polyhedral oligomeric silsesquioxane solution. Subsequently, the melamine foam was immersed to the solution system to form nanoaggregates on the melamine foam surface by the Michael addition reaction in the presence of ultraviolet light. The micro/nano rough structure and low surface energy of the nanoaggregates layer endowed the pristine melamine foam with superhydrophobicity; the water contact angle was greater than 150°. More importantly, the as-prepared melamine foam could withstand harsh conditions, such as a corrosive solution environment, strong ultraviolet light, mechanical compression, high and low temperature exposure, and ultrasonic washing. Driven by gravity, the as-prepared melamine foam could efficiently separate the oil/water mixtures and maintain 98% separation efficiency at high and low temperatures. In addition, it maintained the desirable absorption capability in different oil/organic solvents even after 15 absorption cycles. Accordingly, this facile, low-cost, and robust one-step method provides important support for the superhydrophobic oil/water separation field.

Key words： superhydrophobic melamine foam; thiol-functionalized polyhedral oligomeric silsesquioxane; durable; oil/water separation

Acknowledgements

This work was supported by the National Key Research and Development Program (Grant No. 2017YFB0307700), the Department of Scientific and Technology of Zhejiang Province (Grant No. LGG19E030007), and the Project for the Innovation of High Level Returned Overseas Scholars (or team) in Hangzhou. We also thank the financial support from Department of Scientific and Technology of Yunnan Province (Grant No. 202002AB080002).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://dx.doi.org/10.1007/s11705-021-2124-0 and is accessible for authorized users.

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