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SiO2所得的产物(nano SiO2-NH2)混合,制备了石墨烯片(Graphene Sheets,GS)接枝纳米SiO2杂化材料(nano SiO2-g-GS).以nano SiO2-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nanoSiO2-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 SiO2-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 SiO2-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 SiO2-g-GS含量增加,nano SiO2-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 SiO2-g-GS质量分数为1wt％时,nano SiO2-g-GS/TPU复合材料性能最佳.
The graphene oxide (GO) synthesized by Hummers' method was mixed into coupled product nano SiO2-NH2 obtained by silane coupling agent (APTES) modifying nano SiO2 to prepare nano SiO2 functionally modified graphene sheet composites (nano SiO2-g-GS) through the graphene sheets grafting with nano SiO2.The nano SiO2 functionally modified graphene/thermoplastic polyurethane composites (nano SiO2-g-GS/TPU) were fabricated by melt compounding method using the thermoplastic polyurethane (TPU) as the matrix and nano SiO2-gGS as the filler,and then the fillers and composites were systematically characterized.The tensile tests show that the stress at definite elongation (300 ％,500 ％,1 000 ％) of nano SiO2-g-GS/TPU composites increases due to nano SiO2-g-GS has strengthening effects on the TPU.DSC tests show that the crystallinity temperature of the nano SiO2-g-GS/TPU composites increases significantly compared with pure TPU,and the crystallinity temperature of TPU with 1wt％ mass fraction of nano SiO2-g-GS increases by 44 ℃.The shape memory testing results show that the shape recovery ratio (Rr) of nano SiO2-g-GS/TPU decreases and the shape fixing ratio (Rf) increases with the increase of the mass fraction of nano SiO2-g-GS.The nano SiO2-g-GS/TPU composites with 1 wt％ nano SiO2-g-GS exhibit the best performance.
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