Interphase Structure And Properties Of The Composites Prepared By Thiol-Ene Click Chemistry

It is well known that thiol-ene click chemistry is a very simple, efficient technique. In this study, we built the interphase structure and improved the interphase adhesion property of the materials for the functional modification of composites by thiol-ene click chemistry. The chief content in the paper can be divided into the following two parts.1. Polymethylvinylsiloxane (PMVS) coating/natural rubber (NR) composite films were prepared by thiol-ene click chemistry. The ozone resistant property, surface structure of the composites and the interphase adhesion property of PMVS coating were characterized. The results showed that the coating of the crosslinked PMVS layer on NR resulted in an obvious increase in the ozone resistance of NR. Besides, the trimethylolpropane tris(3-mercaptopropionate) as the crosslinking agent at the interphase can simultaneously react with double bonds of both PMVS and NR under UV irradiation, and improve interphase adhesion strength between NR and PMVS. The adhesion strength of PMVS coating on NR was characterized using cross-cut tape test and it shows that the adhesion strength is good.2. We prepared the vinyl-modified SiO2 coating onto dodecafluoroheptyl methacrylate (DMFA)/styrene butadiene rubber (SBR) by thiol-ene click chemistry. The hydrophobicity and the micro/nano surface structure of the composites were characterized. The results showed that the silica surface has decreased potential and less hydrophilic after modified by KH570 silane coupling agent. There are fluorine elements on the surface characterized by EDS, which will decrease the surface energy. The micro/nano surface structure built by vinyl-modified SiO2 will improve the hydrophobic properties and the largest contact angle can reach about 152°. Besides, the superhydrophobic membranes indicate a huge adhesive force between the substrate surface and the water with a maximum force of 1.92×10-4 N. It is also found water droplets could not slide on the film when the surface is tilted at 90° or even turned upside down. Compared with the surface coated with 4.8mg/cm silica, the surface coated with 3.2mg/cm silica shows a higher drag-efficiency in water. The trimethylolpropane tris(3-mercaptopropionate) can simultaneously react with double bonds of DMFA, SBR and the vinyl-modified SiO2 under UV irradiation, which makes silica firmly fixed on the surface.