Synthesis And Properties Of Polyethersulfone-Polydimethylsiloxane Grafting Copolymers

Polyethersulfone(PES) has an advantage of good adhesion to metal materials as one kind of coating materials. After inducing the polydimethylsiloxane(PDMS), the surface characteristics of PES has been improved. The lower surface energy has changed the surface characteristic from hydrophilicity to hydrophobicity. The aim of this paper is to improving surface property of PES.Hydrosilylation is a very convenient and efficient method for the syntheses of a variety of organosilicon compounds for the study of organosilicon chemistry. In this experiment we synthesize the PES-PDMS graft copolymer by using the hydrosilylation reaction. Firstly, the PES that including C=C in its side chains was obtained. We characterized and analyzed the polymer through ^-NMR, DSC, dissolubility, etc. Then, We characterized and analyzed the PES-PDMS copolymer. Moreover, tracing the hydrosilylation reaction by the FTIR. We got the reaction direction and condition preliminarily. We got the result that surface energy has been lower by the study of surface characteristic.Si29-NMR prove the synthesis result of grafting copolymer. FTIR keep the trace to the hydrosilylation reaction and got the reaction converting rate is 24%. DSC show the Tg had decreased by nearly 40℃contact angle test show that the contact angle had been increased by 30°, the surface energy has been reduced already. The proportion of Si is 8% in the XPS test. These all prove the hydrosilylation reaction has occurred. SEM show the disperse of the grafting copolymer is good. Solubility had been improved after hydrosilylation reaction.We study the hydrosilylation reaction condition at the same time. We also study the reaction temperature,time, the amount of catalyst and the time to put in the catalyst. Then, we got a good experiment result. Finally, we learn that method and product condition to get more product in a time.