功能化改性还原氧化石墨烯-碳纳米管/热塑性聚氨酯复合材料膜的制备及性能

为提高热塑性聚氨酯(TPU)的阻隔及抗静电性能,首先,向功能化改性还原氧化石墨烯(FRGO)中加入原始碳纳米管(CNTs),并通过非共价改性制得在N, N-二甲基甲酰胺(DMF)中均匀分散的杂化粒子FRGO-CNTs;然后,在涂膜机上通过溶液涂覆法制备了FRGO-CNTs/TPU复合材料膜;最后,利用FTIR、XRD、XPS、FE-SEM、TG、氧气透过仪、高阻计及万能试验机对FRGO-CNTs/TPU复合材料膜的结构和性能进行了表征。结果表明:FRGO与CNTs之间通过π-π共轭作用发挥协同效应,并且所制备的FRGO-CNTs与TPU基体的相容性较好;当FRGO-CNTs含量(以TPU为基准)为2.0wt%时,复合材料膜的热分解温度提高了49℃,氧气透过率下降了53.7%;大比表面积的FRGO与高长径比的CNTs能在TPU基体中构建导电网络;当FRGO-CNTs含量仅为0.8wt%时, FRGO-CNTs/TPU复合材料膜的体积电阻率就能下降7个数量级。与此同时,随FRGO-CNTs含量的增加,复合材料膜的拉伸强度和断裂伸长率均先上升而后下降。 

Preparation and properties of functional modification reduced graphene oxide-carbon nanotubes/thermoplastic polyurethane composite films

In order to improve the barrier and antistatic properties of thermoplastic polyurethane (TPU), original carbon nanotubes (CNTs) were added into functional modification reduced graphene oxide (FRGO), and hybrid particles FRGO-CNTs which were uniformly dispersed in N, N-dimethylformamide (DMF) were prepared by non-covalent modification firstly. Then, FRGO-CNTs/TPU composite films were fabricated by solution coating method on the coating machine. Finally, the structures and properties of FRGO-CNTs/TPU composite films were characterized by FTIR, XRD, XPS, FE-SEM, TG, oxygen transmission rate tester, high resistance meter and universal testing machine. The results demonstrate that FRGO and CNTs produce synergistic effect through π-π conjugation, and the prepared FRGO-CNTs show good compatibility with TPU matrix. When FRGO-CNTs content (using TPU as reference) is 2.0wt%, the thermal decomposition temperature of composite film increases by 49℃, and the oxygen transmission rate decreases by 53.7%. The FRGO with large specific surface area and the CNTs with high length to diameter ratio can build the conductive network in TPU matrix. When FRGO-CNTs content is only 0.8wt%, the volume resistivity of FRGO-CNTs/TPU composite film declines by as much as 7 orders of magnitude. Meanwhile, with the FRGO-CNTs content increasing, the tensile strength and elongation at break of composite films both rise at first and then go down.