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采用Hummers法制备了氧化石墨烯(Graphene Oxide,GO),再与经硅烷偶联剂(APTES)偶联改性纳米SiO_2所得的产物(nano SiO_2—NH_2)混合,制备了石墨烯片(Graphene Sheets,GS)接枝纳米SiO_2杂化材料(nano SiO_2-g-GS)。以nano SiO_2-g-GS为填料,热塑性聚氨酯(TPU)为基体,通过熔融共混法制备共混型nano SiO_2-g-GS/TPU复合材料,并对填料和复合材料进行测试和表征。拉伸测试显示nano SiO_2-g-GS的加入对基体TPU有一定的补强作用,使复合材料定伸应力(300%、500%和1 000%)增大。DSC测试显示,与纯TPU相比,nano SiO_2-g-GS/TPU复合材料的结晶温度有大幅升高,填料含量为1wt%时,TPU的结晶温度升高了44℃。形状记忆测试结果显示,随nano SiO_2-g-GS含量增加,nano SiO_2-g-GS/TPU复合材料的形状回复率(Rr)逐渐降低,但形状固定率(Rf)逐渐升高。当nano SiO_2-g-GS质量分数为1wt%时,nano SiO_2-g-GS/TPU复合材料性能最佳。
Graphene oxide (GO) was prepared by Hummers method and then mixed with nano SiO_2-NH_2 by coupling with modified nano-SiO 2 through silane coupling agent (APTES) to prepare graphene sheets , GS) grafted nano-SiO_2 hybrid materials (nano SiO_2-g-GS). The nano-sized SiO 2-g-GS / TPU composites were prepared by melt blending with nano SiO 2 -g-GS as filler and thermoplastic polyurethane (TPU) as matrix. The filler and composite materials were tested and characterized. Tensile tests show that the addition of nano SiO 2 -g-GS has a certain reinforcing effect on the matrix TPU, and the tensile stress (300%, 500% and 1000%) of the composite increases. The DSC results showed that the crystallization temperature of nano-SiO_2-g-GS / TPU composites increased greatly compared with that of pure TPU. When the filler content was 1wt%, the crystallization temperature of TPU increased by 44 ℃. The shape memory test results showed that the shape recovery rate (Rr) of nano-SiO_2-g-GS / TPU composites decreased gradually with the increase of nano-SiO_2-g-GS content. The nano SiO_2-g-GS / TPU composites showed the best performance when nano-SiO_2-g-GS was 1wt%.