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为了研究氧化石墨烯(GO)对聚合物基复合材料力学性能的影响,通过溶液混合法制备了GO/聚乙烯醇(PVA)复合材料。然后,采用XRD、TEM、FTIR、DSC和纳米压痕实验等研究了GO/PVA复合材料的结构、界面结合性能、力学性能、蠕变行为和吸水膨胀率。结果表明:GO可以均匀分散在PVA基体中,二者之间主要通过氢键作用结合,具有较高的界面结合力;与纯PVA相比,1wt%GO/PVA复合材料的硬度和有效弹性模量分别提高了28.9%和23.3%,压入蠕变深度下降了19.8%;GO/PVA复合材料具有较低的无限剪切模量与瞬时剪切模量比,表明GO提高了PVA的蠕变抗力;GO的添加同时增加了GO/PVA复合材料的阻水性并降低了膨胀系数。吸湿纳米压痕实验结果表明:纯PVA的力学性能会随吸湿时间延长而下降,而GO/PVA复合材料吸湿72h后的力学性能基本保持不变。所得结论为石墨烯增强聚合物基复合材料的研究提供了理论指导。
In order to investigate the effect of graphene oxide (GO) on the mechanical properties of polymer matrix composites, GO / polyvinyl alcohol (PVA) composites were prepared by solution mixing. The structure, interfacial bonding properties, mechanical properties, creep behavior and water swelling of GO / PVA composites were investigated by XRD, TEM, FTIR, DSC and nanoindentation experiments. The results show that GO can be uniformly dispersed in the PVA matrix, and the bonding between the two is mainly through hydrogen bonding. Compared with pure PVA, the hardness and effective elastic modulus of 1wt% GO / PVA composite The amount of compressive creep decreased by 19.8% and GO / PVA composites had lower infinite shear modulus and instantaneous shear modulus ratio respectively, which indicated that GO improved the creep of PVA The addition of GO also increased the water resistance of GO / PVA composites and reduced the expansion coefficient. The results of hygroscopic nanoindentation experiment show that the mechanical properties of pure PVA decrease with the increase of hygroscopic time, while the mechanical properties of GO / PVA composite remain the same after 72h. The conclusions obtained provide theoretical guidance for the research of graphene reinforced polymer matrix composites.