Study On Effects Of Carbon Nanotubes On Creep Property Of Polymers And Polymer Matrix Composites

Due to larger creep than matel and ceramic matrix composites,polymer matrix composites are restricted in applications on structures requiring high size stability.In this paper,carbon nanotubes(CNTs)and epoxy resin were chosen as reinforcement and matrix respectively.Effects of CNTs contents and their surface functional groups on creep property of the epoxy resin matrix were studied.The glass transition temperatures(Tg)and characteristic frequencies of the epoxy resin castings were tested by dynamic mechanical analysis.The time-temperature superposition principle has been applied to construct master curves and predict long-term creep behavior of CNTs/epoxy resin castings at room temperature from measured short-term creep behavior at elevated temperatures.In this paper,we also studied the creep behavior of hybrid of CNTs and carbon fibers reinforced epoxy resin composites,evaluating effects of pristine and amino CNTs on bending creep property of CNTs-T700/E-51 composites.The results showed that CNTs increased tensile modulus and reduced creep strain of the epoxy resin,significantly.However,the Tg of epoxy resin castings are higher than that of CNTs/epoxy resin castings,among which amino CNTs/epoxy resin is of the highest Tg.The predicted creep strains of the pure epoxy resin and CNTs/epoxy in one year duration are 1.44% and 1.15%,respectively,that is to say that,the involvation of 0.5% phr CNTs decreased the creep strain of epoxy in one year duration by 20.14%.