Carbon/carbon composites derived from poly(ethylene oxide)‐modified novolac‐type phenolic resin: Microstructure and physical, and morphological properties

A poly(ethylene oxide) (PEO) novolac-type phenolic resin blend was prepared by the physical blending method. The modified novolac-type phenolic resin with various PEO contents was used as a matrix precursor to fabricate carbon/carbon composites. The effect of the PEO/phenolic resin mixing ratio on the change of the density and of the porosity was studied. The flexural strength and interlaminar shear strength of the PEO/phenolic resin blend-derived carbon/carbon composites were also investigated. The results show that the density of the PEO/phenolic resin blend-derived carbon/carbon composites decreases with the PEO content. The X-ray diffraction and Raman spectra studies showed that the carbon fiber in the samples will affect the growth of the ordered carbon structure. From SEM morphological observation, it is shown that the fracture surface of specimens is smooth. Also, there is less fiber pull-out and fiber breakage on the fracture surface.