抄録
Static strength tests were carried out for the CNF/epoxy two phase composites and CF/CNF/ epoxy three phase laminates in tension, compression, and flexure. The used CNF was cup-stacked type carbon nanofiber (CSNF) made by GSI Creos Corporation. Two different lengths of CSNF dispersed epoxy were employed. Moreover, each CSNF was dispersed to epoxy resin with the ratio of 5-wt% and 10-wt% respectively. An epoxy resin EP827® and a hardener of aromatic amine EPIKURE W® (Japan Epoxy Resin Co. Ltd.) are also employed. TORAYCA® C6343 was employed as reinforcement of three phase laminates. The obtained mechanical properties were compared with the neat epoxy and conventional CFRP laminates. It is revealed that the present three phase laminates exhibit higher compressive and flexural strengths than conventional CFRP laminates. However, dispersion of the CSNF to epoxy may not affect modulus and strengths of the three phase laminates in tensile loading. In CSNF/epoxy composites, there is a trend that increase in CSNF weight makes higher modulus and strengths. It can be concluded that a potential of CSNF as the modifier agent of epoxy for higher mechanical properties is demonstrated in CSNF/epoxy composites and compressive strengths of three phase laminates.
