Effects of POSS modified graphene oxide in anti-corrosion and hydrophobic properties of coatings
The cage sesquisiloxane(POSS)of organic-inorganic hybrid material was prepared by self-hydrolytic condensation of organosilicon compound γ-aminopropyl triethoxysilane(APTES),and then it was grafted onto graphene oxide(GO)to overcome aggregation of GO.The grafting rate was determined to be 98.3%by Boehm titration,and further loaded with zinc ions to prepare composite nanoparticles POSS/GO/Zn.The structure and microstructure of POSS/GO/Zn were characterized with FT-IR,XRD,Raman,NMR,and SEM,and applied to waterborne epoxy resin(WEP)coating materials.The electrochemical impedance spectroscopy(ESI)and water contact angle results showed that the composite coating of the obtained nanoparticles presented the excellent anti-corrosion and hydrophobic properties.The impedance value of POSS/GO/Zn/WEP after being soaked in 3.5%sodium chloride solution for 40 days was 8.33×105 Ω·cm2,which was greater than the initial value of 1.46×105 Ω·cm2 on the first day of immersion of the blank epoxy coating.The water contact angle increased from 48.42° to 98.11°,and the property of coating changed from hydrophilic to hydrophobic,indicating that the POSS/GO/Zn has good potential for application in coatings.
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