摘要
本文选择了3种经不同表面改性处理的纳米SiO2,采用热分析(TG)和红外光谱(FTIR)对聚乙烯/改性纳米SiO2复合材料的热稳定性能及结构变化进行了研究,并将其用于无卤阻燃聚乙烯体系,针对改性纳米SiO2对无卤阻燃聚乙烯阻燃性能和力学性能的影响进行了分析。研究结果表明,与未改性纳米SiO2相比,经改性处理的纳米SiO2有利于提高复合材料的热稳定性能,延缓聚乙烯的热氧化降解,经适当改性处理,可使纳米复合材料的热稳定性高于聚乙烯。FTIR结果证实二氧化硅主要发挥物理作用,改性方法对降解后体系结构影响不大。改性纳米SiO2显著提高了无卤阻燃聚乙烯的阻燃性能,在填料用量相同时,可获得力学性能和阻燃性能较佳的材料。
Three kinds of surface treated nano SiO2 were added in polyethylene（PE） and PE/ATH system to discuss the effects of surface treatment on thermal and flame retardant properties of composites.Thermal stabilities of PE/nano-SiO2 composites were investigated by thermal gravimetric analysis（TG）.Effects of surface treated nano-SiO2 on structure of system after treated at 400℃ were studied by Fourier transform infrared spectroscopy（FTIR）.The results showed that PE/nano-SiO2 with appropriate surface treatment possesses better thermal stability than PE or PE/ nano-SiO2 without surface treatment.FTIR confirmed the physical effect of nano silica on thermal properties and the little influence of surface treatment on the structure of degraded system.The flame retardant properties of PE/ATH were greatly improved by addition of treated silica.PE/silica/ATH system possessed better mechanical properties and flame retardant properties at the same loading of fillers.
出处
《化学工程师》
CAS
2008年第7期14-17,共4页
Chemical Engineer
