Fabrication of Cellulose Nanofiber/Glass Fiber-reinforced Composites and Their Bending Behavior Evaluation

摘要

It is required a joint technic with excellent mechanical properties to fabricate glassfiber reinforced plastic (GFRP) components. However, it is well-known that themechanical jointing often causes the fracture of fiber reinforced plastics. It seems thatthe adhesive bonding is suitable to joint GFRPs, and it is necessary to develop anadhesive with outstanding mechanical properties. Recently, cellulose nanofibers(CNFs) have been obtained from plants by mechanical and chemical methods and ithas been reported that CNFs have remarkable mechanical properties. In this study, weinserted epoxy resin with CNFs between GFRP and investigated its bending behavior,to estimate the capability of epoxy resin with CNFs as an adhesive for GFRPs. Theflexural behavior and modulus of GFRP was similar regardless of the inserted part ofepoxy resin with CNFs layer in GFRP. The flexural strength of GFRP was drasticallyincreased (up to 600 MPa) by the insert of epoxy resin with CNFs of 5 or 10 wt.%,although that of GFRP was decreased by the insert of epoxy resin with CNFs of 25wt.%. Therefore, it seems that the epoxy resin with CNFs is available as an adhesivefor GFRP. However, it is required the observation of CNFs dispersion in epoxy resinto understand the strengthening mechanism of epoxy resin with CNFs.