New nanocomposite based on the cellulose nanofibers and epoxy resin

摘要

The cellulose nanofibers (CNFs) were made from the wood powder with the chemical and the mechanical treatment. The image of the scanning electron microscopy (SEM) could help to analysis the morphology of the obtained CNFs combined with the photographs of dispersions of the CNFs' suspensions. It was found the fibers distribute uniformly, and the high aspect ratio was calculated through the SEM images. Then the obtained CNFs were used as the fiber-reinforced material in the epoxy composite because of their structure of the network and the high aspect ratio. The mechanical properties of the epoxy nanocomposite were evaluated by tensile test, and the increase in Young's modulus was observed at different fiber contents. The mechanism of action was analyzed combined the tensile test and the SEM images of fracture surface that the CNFs restricted the free movement of thermoset polymer chains by crack tip pinning. In the further study, more different content of the CNFs will be observed in the epoxy composites.