氧化石墨烯的制备及其在PET薄膜改性上的应用

Preparation of Graphene Oxide And Its Application in Modification of PET Thin Films

石墨烯是一种由碳原子sp^2杂化形成的二维蜂窝状结构,具有"零渗透"的优点,在阻隔性包装材料中具有较大的发展潜力。本文采用改良的Hummers法制备了氧化石墨烯片层,考察了不同氧化程度、不同分散介质与氧化石墨烯分散性、透明性的关系;将其涂布在PET薄膜上,进一步探索其对薄膜阻隔性能的影响。研究结果表明随着氧化程度的增加,氧化石墨烯GO在水中的分散性增大,在分散介质中加入PAA和PVA有利于分散性的提高,但PAA优于PVA;此外,涂布后PET薄膜的氧气透过量降低了30%,水蒸气透过量降低了20%,GO涂布后有效的提高了PET薄膜的阻隔性。

Graphene is a carbon atom with two-dimensional honeycomb structureby sp2 hybrid, it has the advantage of ＂zero penetration＂, and there is great potential in the development of packaging material. The preparation of graphene oxide layers was by modified Hummers method. The relationshipbetween different oxidation degrees, dispersion mediums and dispersity of graphene oxide and transparency was studied. In addition, its effects on thin film barrier performance was explored by coating on the PET films. The results showed that graphene oxide dispersion of GO increased with the increase of oxidation degree in the water.Furthermore, adding PAA and PVA increased the dispersity, but PAA is superior to PVA.Moreover, the oxygen transmittance of PET film decreased by 30%, and the water vapor transmittance decreased by 20%. The barrier of PET film was improved effectively by coating.