POSS改性氧化石墨烯对涂层防腐和疏水性能的影响

Effects of POSS modified graphene oxide in anti-corrosion and hydrophobic properties of coatings

通过有机硅化合物γ-氨丙基三乙氧基硅烷(APTES)自水解缩合制得有机-无机杂化材料笼型倍半硅氧烷(POSS),将其接枝到氧化石墨烯(graphene oxide,GO)上以克服GO的聚集,利用Boehm滴定法测定接枝率为98.3%,进一步负载锌离子制得复合纳米粒子POSS/GO/Zn。通过FT-IR、XRD、Raman、NMR和SEM对POSS/GO/Zn结构及微观形貌进行了表征,并将其应用在水性环氧树脂(WEP)涂层材料中,电化学阻抗谱(EIS)和水接触角测试结果表明,所制得的纳米粒子的复合涂层具有优异的防腐和疏水性能,在3.5%氯化钠溶液中浸泡40 d后POSS/GO/Zn/WEP的阻抗值为8.33×10^(5)Ω·cm^(2),大于空白环氧涂层浸泡第一天的初始值1.46×10^(5)Ω·cm^(2),水接触角由48.42°增大至98.11°,涂层由亲水转为疏水特性,表明该材料在涂层材料中具有良好的应用潜能。

The cage sesquisiloxane(POSS)of organic-inorganic hybrid material was prepared by self-hydrolytic condensation of organosilicon compoundγ-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 8.33×10^(5)Ω·cm^(2),which was greater than the initial value of 1.46×10^(5)Ω·cm^(2) 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.