Fabricating Interface Coupling Between Filler And Elastomer By Thiol-Ene Click Chemistry And The Properties Of Composites

As is known to us that thiol-ene click chemistry is very efficient and could react in mild conditions. In this study, we fabricated elastomer nanocomposites and achieved the interface coupling between and filler by thiol-ene click chemistry. And the main content of this paper could be divided into the following two parts.1.Slicon rubber with good anti-oxidation, temperature resistant property and bioinert, which production is independent of fossil fuel, has attracted great attention in the past few years. However, the compatibility between silicon rubber and fillers is very weak, which hampers the application of silicon rubber. POSS, a kind of nano-filler with excellent property, could improve the thermostability and mechanical property of rubber significantly. If we fill POSS in silicon rubber derectly, because of the weak compatibility, POSS could not make the property of silicon rubber well. In order to solve these problem, vinyl-POSS was modified by TMPMP using click reaction, and the product was characterized result in the required one. Then, the modified POSS was filled in the PMVS by solution process. Finally, the PMVS was crosslinked by thiol-ene click reaction initiated by UV. The thermostability of PMVS and dispersity of POSS was characterized. Results display that the thermostability of PMVS crosslinked by POSS characterized by TGA is better than the one crosslinked by TMPMP. And dispersity of POSS characterized by SEM is so well. The molecular level dispersity may be attributed to click chemistry.2.Superhydrophobic materials are new kind of function materials with good application in drug release, self-clean materials and oil-water separation. But there are few researches to make a kind of superhydrophobic elastomer. And It is difficult to fabricate superhydrophobic coatings. Besides, the anti-scratching properties of these coatings are usually so weak. In order to solve these problems, silica was first silanized by KH580, Then added Vinyl-POSS and initiated click reaction by UV. In this way, Vinyl-POSS was grafted on the surface of silica. Besides, the structure of POSS-g-silica was characterized. SBR was used as the substrate with polar DFMA, TMPMP and MMMP filling in it in a solution process. Due to poor compatibility between SBR and DFMA, DFMA would enrich on the surface of SBR. Then POSS-g-silica was sprayed on the surface. Finally, click reaction was initiated by the UV with the DFMA polymerization (P-DFMA) and grafting onto the surface of nano-silica, simultaneously, covalent bond forming between nano-silica and SBR via P-DFMA bridging. As a result, a stabilized superhydrophobic coating with the contact angle up to 150o and ultrahigh adhesive force (2.48×10-4N) to water was achieved. Besides, such high adhesive force makes water droplets not slide on the surface of material when the surface is tilted at 90°or even turned upside down. Moreover, the adhesion strength between the coating and substrate is so large, which makes the good anti-scratching property of the coating. It is all because of the strong interface coupling between filler and SBR which is attributed to thiol-ene click chemistry.