共混型石墨烯-nanoSiO_2/TPU复合材料的制备与性能

Preparation and properties of blended graphene oxide-nano SiO_2/TPU composites

采用熔融共混技术制备了氧化石墨烯（GO）-nano SiO_2杂化材料填充改性的形状记忆热塑性聚氨酯（GO-nano SiO_2/TPU）复合材料,探讨了GO-nano SiO_2杂化材料对复合材料力学性能、熔融指数及形状记忆性能的影响。结果表明：GO-nano SiO_2含量对GO-nano SiO_2/TPU复合材料的力学性能有明显的影响,其含量为0.5wt%~1wt%时,GO-nano SiO_2/TPU复合材料的综合力学性能较好。熔融指数分析表明,填料的加入会降低材料的加工流动性能。形状记忆性能研究表明,加入GO-nano SiO_2杂化材料使得GO-nano SiO_2/TPU复合材料的形状固定率先降低后上升,在含量为1wt%后上升趋势更加明显;而形状回复率随填料含量的增加而呈降低趋势,并且在100℃高温这种变化趋势更加明显和稳定,回复温度越高,形状回复率越好。

Graphene oxide（GO）-nano SiO2 hybrid materials filled modified shape memory thermoplastic polyure-thane （GO-nano SiO2/TPU）composites were prepared through melt blending technology.The effects of GO-nano SiO2 hybrid materials on the mechanical properties,melt index and shape memory properties of composites were in-vestigated.The results show that the content of GO-nano SiO2 has an obvious influence on the mechanical properties of GO-nano SiO2/TPU composites.When the content of GO-nano SiO2 is in the range of 0.5wt%-1wt%,the GO-nano SiO2/TPU composites show the best comprehensive mechanical properties.Melting index analysis indicates that the incorporation of filler decreases the flowability of materials.Shape memory property tests indicate that the shape fixed rate of GO-nano SiO2/TPU composites decreases firstly,and then increases with addition of GO-nano SiO2 hybrid material.Especially the rising trend is more obvious when the filler content is higher than 1 wt%.The shape recovery rate decreases with the increasing of filler content.And this trend is more obvious and stable at 100 ℃ high temperature,the higher the recovery temperature,the better the shape recovery ratio.