Abstract: In order to develop carbon fiber reinforced wood-based composites, four kinds of structure with eucalyptus-poplar composite panel were designed with eucalyptus/eucalyptus, poplar/poplar, crossed poplar/eucalyptus and eucalyptus/poplar, and the carbon fiber (CF) was covered on the surface of composite panel to enhance its properties. The physical mechanical properties and thermal insulation properties of CF reinforced eucalyptus-poplar composite panel were analyzed and the performance changes were discussed before and after aging. After the carbon fiber surface enhancement, the physical and mechanical properties of the four kinds of eucalyptus-poplar composite panel have been greatly improved. Among them, the expansion rate of water absorption of eucalyptus/poplar was 2.6%, for which the decrease rate was 44.7%, and the water absorption rate decreased by 46.5%. The delamination properties of the four structures all meet the standard, and the best was poplar/eucalyptus. The longitudinal modulus of rupture of eucalyptus/poplar was 98.5 MPa before aging, and the improvement rate was 107.4%. The longitudinal modulus of elasticity of eucalyptus/poplar was 15810 MPa before aging, for which the improvement rate was 129.8%. The longitudinal modulus of elasticity of the aged poplar/eucalyptus was 10150 MPa, for which the increased rate was 176.3%, and the bonding strength of poplar/eucalyptus was up to 1.74 MPa. Whereas, the transverse modulus of rupture, modulus of elasticity and bonding strength of the composites were smaller than those of the control group. Overall, the structure of poplar/eucalyptus and eucalyptus/poplar by the carbon fiber enhanced surface had better physical and mechanical properties, and the ratio of longitudinal and transverse strength of the eucalyptus-poplar composite panel was quite different. In the practical application, the aspect ratio of longitudinal and transverse strength need to be adjusted according to the demand. After the surface enhancement of the carbon fiber, the average thermal conductivity of eucalyptus-poplar composite panel was 0.44 W/(m·℃). As indicated, and the thermal conductivity was close to the insulation, and the effect of carbon fiber on the thermal insulation properties of eucalyptus-poplar composite panel was not significant.

Key words: carbon fiber, eucalyptus-poplar composite panel, container