Preparation and properties of nano SiO2 functionally modified graphene/thermoplastic polyurethane composites
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摘要: 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nano SiO2-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。Abstract: 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-g-GS 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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Key words:
- thermoplastic polyurethane /
- functionalized graphene /
- composites /
- shape memory /
- melt mixing
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