Changes of Structure and Bending Strength with Heat Treatment of Three-Dimensional Carbon Fiber-Reinforced Furan Resin

• Published in: KOBUNSHI RONBUNSHU Vol. 62; no. 2; pp. 75 - 80
• Main Authors: OZAWA, Shinichiro, IWAI, Toshiro, ARUGA, Atsushi, KAWAMURA, Kazuro
• Format: Journal Article
• Language: Japanese
• Published: The Society of Polymer Science, Japan 01.01.2005
• Subjects: Bending Strength; Carbon Fiber Cloth; FRP; Furan Resin; Heat Treatment
• ISSN: 0386-2186; 1881-5685
• DOI: 10.1295/koron.62.75

Three-dimensional carbon fiber-reinforced furan resin (3D-CFRFR) containing 44 vol% fiber was made. The 3D-CFRFR samples were heat-treated at various temperatures up to 1000°C. The volume shrinkage of the 3D-CFRFR was a few%. In case of the cured furan resin, the volume shrinkage was almost 50% at a heat treatment temperature (HTT) of 1000°C. The bending strength decreased as the HTT rose. The effect of carbon fiber on the furan resin was recognized at the HTT values below 500°C. The decrease of bending strength may be caused by the separation of fibers from the matrix and the resulting damage of carbon fibers. The cause is the pyrolysis of matrix furan resin. The bending strength and the elastic modulus of the vertical direction to the thickness (σt, Et) were larger than those of vertical direction to the surface (σs, Es) of the stacked carbon fibers of the 3D-CFRFR. The linear relationships were recognized for the bending strength and the elastic modulus: the relations were a = 2.7σs and Et=1.7Es.