دانلود رایگان مقاله پوشش فوق آبگریز مقاوم توسط سیلوکسان فلوئوردار thiol-ene

abstract

In this work, we present one-step dip-coating strategy for fabricating robust, self-healing and superhydrophobic coatings using a coating solution that contains a novel branched thiol-ene fluorinated siloxane (T-FAS), polydimethylsiloxane (PDMS) elastomer and hydrophobic fumed silica nanoparticles (SiO2 NPs). The novel branched T-FAS, with low fluorinated surface energy and high sol-gel reactivity, was prepared by introducing (N-methyl-perfluorohexane-1-sulfonamide) ethyl acrylate (FSA) and gmethacryloxypropyltrimethoxysilane (MPS) into pentaerythritol tetra (3-mercaptopropionate) (PETMP) via thiol-ene click reaction. The superhydrophobic coating, being high stable to strong acid, UV, thermal and smudge treatment, has a water contact angle of 165 ± 2
and shedding angle of 4 ± 1
. It can withstand at least 100 cycles of abrasion with 1500 grit sandpaper under 45 KPa due to the interpenetrating polymer networks (IPN) constructed by T-FAS/PDMS. The IPN is also self-healing to chemically etching using long perfluoro-terminated chains of T-FAS which can spontaneously reorient to new air interfaces. The robust self-healing IPN may lead to the development of new efficient strategies for durable protective coatings in various applications.

4. Conclusion

In summary, we developed a superhydrophobic interpenetrating polymer network that consists of a novel branched TFAS, PDMS and SiO2 NPs with self-healing properties. The novel branched T-FAS using an average of two long hydrolysable silane and fluoroalkyl chains, respectively as body and arms, provides highly durable and self-healing superhydrophobicity. Such robust, self-healing, superhydrophobic coatings from T-FAS and PDMS may be useful for the development of robust protective coatings for various applications.