セルロースナノファイバーシートを適用したCFRPの強度特性

抄録

Carbon fiber reinforced plastics (CFRPs) have the properties of high strength and lightweight, and it has been applied for aircrafts or automobiles. Recently, cellulose nanofibers (CNFs) have been found to be superior in strength, thus, researches are being conducted to enhance the strength of CFRP by applying CNF. However, since CNF is hydrophilic, a hydrophobic treatment is inevitable. Previously, authors have reported that the electrodeposition resin molding method to manufacture CFRPs using the electrodeposition solution (EDS) containing a polymer with epoxy group, and the strength enhancement by CNFs could be possible. In this study, to improve the strength of CFRP conventionally manufactured by prepregs, a method was developed to disperse CNFs between prepregs using EDS. Carrying out the three-point bending test, the effects of the dispersed CNF on the bending stiffness and strength were clarified. As a result, the bending stiffness per weight (specific bending stiffness) increased in proportion to the weight fraction of CNF, and was approximately 2.9 times that of the CFRP specimen without CNF when the CNF weight fraction was 17 %. In the same manner, the bending strength per weight (specific bending strength) was approximately 1.6 times that of the CFRP specimen without CNF when the CNF weight fraction was 22 %.