功能化石墨烯改性PVAL复合薄膜的合成与表征

Synthesis and Characterization of PVAL Composite Films Modified by Functionalized Grapheme

通过对石墨烯表面的功能化修饰，合成聚乙烯醇（PVAL）／氧化钇／石墨烯和PVAL／氧化锌／石墨烯两种复合薄膜。利用扫描电子显微镜、傅立叶变换红外光谱、X射线衍射、紫外-可见分光光度计等分析手段对其进行表征。结果发现，用氧化钇或氧化锌改性后的石墨烯在PVAL基体中具有良好的分散性，PVAL／氧化钇／石墨烯和PVAL／氧化锌／石墨烯复合薄膜都表现出较高的透过率，分别为24％和30％；在波长200—250nm，PVAL／氧化钇／石墨烯复合薄膜与PVAL／氧化锌／石墨烯复合薄膜相比，前者对紫外光的吸光度更大，说明此材料对紫外线的吸收及散射能力更强，具有较好的屏蔽紫外线功能及抗老化性能。

By functionalizing and modifying on the surface of the graphene nanosheets （GNS）, the two kinds of improved poly（vinyl alcohol）（PVAL） films were prepared, which were PVAL / Y2O3 / GNS and PVAL / ZnO / GNS separately, and their structures were characterized via scanning electron microscope, Fourier infraredspectroscopy, X-ray diffraction and ultraviolet analysis. The results demonstrate that the GNS modified by Y2O3 or ZnO has favorable dispersibility in the PVAL matrix, meanwhile, PVAL / Y2O3 / GNS and PVAL / ZnO / GNS composite films show high transmittance, which are 24% and 30%, respectively. The former shows better absorbance than the latter in 200-250 nm of UV light wavelength, the results show that PVAL/Y2O3 /GNS composite film has good UV absorption and scattering ability, and shows better barriering UV and anti-aging performance.