GO填充与老化处理对辐照交联UHMWPE/VE复合材料分子结构的影响

The Influence of GO Filling and Aging Treatment on the Molecular Structure of Irradiated Cross-linked UHMWPE/VE Composites

采用改良Hummers工艺制备了氧化石墨烯(GO),通过超声分散、液相球磨混合与热压成型工艺制备了超高摩尔质量聚乙烯/维生素E/GO(UHMWPE/VE/GO)纳米复合材料,在真空环境下采用γ射线对其进行辐照改性处理,并将部分样品置于80℃环境下热氧老化处理21 d。采用扫描电子显微镜(SEM)分析了GO在UHMWPE/VE复合材料基体中的分散性,通过傅立叶红外光谱(FT-IR)、示差扫描量热计(DSC)与凝胶含量实验对样品分子结构进行表征。研究结果表明,GO均匀地分散于UHMWPE/VE复合材料基体中;GO填充提高了辐照交联UHMWPE/VE复合材料的结晶度;GO填充略微降低了材料的凝胶含量;老化处理对辐照交联UHMWPE/VE/GO复合材料的分子结构未有明显影响。

Graphene oxide （GO） was prepared through modified Hummers process, and then ultra- high molecular weight polyethylene （UHMWPE） /vitamin E （VE）/GO nano-composites were fabricated by ultrasonic dispersion, liquid ball mill mixing and hot-forming, followed by ray irradiation modification in vacuum environment. Parts of samples were aged at 80 ℃ for 21 d. The distribution of GO in the UHMWPE/ VE matrix was analysised by scanning electron microscope （SEM）. The samples were characterized by Fourier infrared spectroscopy （FFIR）, differential scanning calorimetry （DSC）, gel content test. Meanwhile the mechanical properties and oxidation resistance of the material were studied. The results show that GO sheets were distributed homogeneously within the UHMWPE/VE matrix; the crystallinity of the UHMWPE/VE/GO composites was improved with the filler of GO and irradiation ; the gel content of materials was reduced slightly with the filler of GO; aging treatment lead no significant effect to the molecular structure of cross-linking UHMWPE/VE/GO composites.