论文部分内容阅读
为制备接枝聚乙烯与SiO2的复合材料,赋予其新的特殊性能,首先,通过预辐照和悬浮接枝技术制备了低密度聚乙烯接枝聚苯乙烯(LDPE-g-PS),通过表面接枝制备了PS改性纳米SiO2(PS@nano-SiO2);然后,将LDPE-g-PS与PS@nano-SiO2熔融共混,制备了PS@nano-SiO2/LDPE-g-PS复合材料;最后,利用FTIR、SEM、DSC和电子拉力机等对材料的结构及性能进行了研究。结果表明:PS已经分别接枝到LDPE和纳米SiO2上;在PS@nano-SiO2/LDPE-g-PS复合材料中,SiO2在LDPE-g-PS内达到纳米级分散,并形成独特的纤维状网络结构;2wt%PS@nano-SiO2/LDPE-g-PS复合材料的冲击强度比LDPE-g-PS提高了99.3%;与LDPE-g-PS相比,PS@nano-SiO2/LDPE-g-PS复合材料的结晶温度升高,击穿场强比LDPE的高1.4倍。所得结论表明PS@nanoSiO2/LDPE-g-PS复合材料的性能较好。
In order to prepare new special properties of grafted polyethylene and SiO2 composites, firstly, low density polyethylene grafted polystyrene (LDPE-g-PS) was prepared by pre-irradiation and suspension grafting techniques, PS modified nano-SiO2 (PS @ nano-SiO2) was prepared by surface grafting. Then, LDPE-g-PS and PS @ nano-SiO2 were melt blended to prepare PS @ nano-SiO2 / LDPE-g-PS Finally, the structure and properties of the materials were investigated by FTIR, SEM, DSC and electronic tensile testing machine. The results show that PS has been grafted onto LDPE and nano-SiO2, respectively. In the PS @ nano-SiO2 / LDPE-g-PS composites, SiO2 reaches nanoscale dispersion in LDPE-g-PS and forms a unique fibrous The impact strength of PS @ nano-SiO2 / LDPE-g-PS composites was improved by 99.3% compared with that of LDPE-g-PS. -PS composites increased the crystallization temperature, breakdown strength higher than LDPE 1.4 times. The results show that PS @ nanoSiO2 / LDPE-g-PS composites perform well.