A promising reinforcement for textile composites: Study on the effect of cellulose nanofiber (CNF) content on the mechanical properties of CNF reinforced epoxy resin

13th International Conference on Textile Composites

Li, Xingsheng^1 ; Hanaki, K.^1 ; Wang, X.^1 ; Kurashiki, T.^1 ; Mukoyama, K.^1

Management of Industry and Tchnology, Graduate School of Eng., Osaka Univ., 2-1, Yamadaoka, Suita Osaka

565-0871, Japan^1

关键词: Crack generation;    Deformation energy;    Maximum stress;    Percentage elongation;    Reinforced epoxy;    Reinforcement effects;    Tensile shear test;    Textile composite;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/406/1/012037/pdf
DOI  :  10.1088/1757-899X/406/1/012037

来源: IOP

【 摘 要 】

The reinforcement effect of volume fraction of CNF on different matrix resin (vinyl-modified epoxy ester resin emulsion; epoxy-modified alkyd emulsion) are investigated in this study. Tensile shear test is carried out following the JIS K 6850:1999 standard, by coating this colloid mixture on substrates. The results show that the maximum shear strength of both waterborne resin increase with the addition amount of CNF at relative humidity 32.78%. It is considered that there exits hydrogen bonding between fiber and matrix, and the stress concentration might be relieved by the 3-D network structure of CNF, thus the maximum stress is increased, and the crack generation and development is suppressed. But it leads to a loss of percentage elongation values. A peak of the deformation energy is found at 10wt.%, which is considered as a force balance point of 3-D network reinforcement and the aggregation of CNF at the interface. The reinforcement of CNF is sensitive to humidity, for epoxy ester matrix is found more easily influenced by humidity than alkyd matrix, which has bigger deformation energy than alkyd matrix in low humidity(32.78%RH), although deformation energy dramatically decreases in high humidity(97.30%RH), it still has compatible humidity as alkyd matrix.