溶胶-凝胶法制备PEW/SiO2杂化材料及表征

通过熔融接枝反应将乙烯基三甲氧基硅烷（VTMS）接枝到聚乙烯蜡（PEW）分子链上，接枝物红外光谱（FTIR）的1090、1030、960 cm^-1等处出现了—Si—O—CH3的特征吸收峰。以正硅酸乙酯（TEOS）为前驱体，混入接枝PEW中，通过溶胶-凝胶法（sol-gel）制备了PEW/SiO₂杂化材料。使用透射电镜（TEM）和热重分析（TG）研究了杂化材料的形态及性能，结果表明，通过sol-gel可以制备SiO₂含量为0. 98%～4. 12%的杂化材料，SiO₂颗粒与PEW接枝物分子间具有良好的相容性，纳米SiO2的存在提高了PEW的耐热性能，当SiO₂含量为3. 75%时，PEW的分解温度提高了21. 34℃。

Preparation and characterization of PEW/SiO2 hybrid materials

The molt grafting reaction was employed to graft vinyl trimethoxysilane（VTMS）to polyethylene-wax（PEW），and the characteristic absorbance peaks at 1090 cm^-1，1030 cm^-1 and 960 cm^-1 in FTIR spectra proved the successful grafting. As a precursor，tetraethoxysilane（TEOS）was mixed with grafted PEW and then a PEW/SiO_² hybrid material could be prepared by the sol-gel process. The morphology and properties of the hybrid were studied with FTIR，TEM and TG/DTA. The study indicates that the hybrid containing 0. 98%—4. 12% of SiO₂ could be prepared via the sol-gel process and good compatibility of the molecules of grafted PEW and SiO₂ particles was observed. The study also showed that the thermostability of PEW was improved at the presence of nano-SiO₂ particles. The decomposing temperature of PEW was increased by 21. 34℃ when 3. 75% of SiO₂ was present.