Different shaped carbon fibers (R-, I-, C-, Y-, and X-type) were prepared from melt-spinning of reformed naphtha cracking bottom oil precursors through various shaped spinnerets. These different shaped CFs (carbon fibers) and PVC (polyvinyl chloride) resin were compounded, and then CF/PVC composites were prepared. Precursor pitch, carbon fibers, and composites were characterized and their properties were compared. Mechanical properties of carbon fibers and composites were characterized relating to external surface area and ratio of perimeter to cross-sectional area of carbon fibers. The tensile strength of tetralobal fibers (X-type) showed five times higher than that of round-shaped fibers (R-type) due to extended external surface area. Their tensile strength of CF/PVC composite increased as ratio of perimeter to cross-sectional area of carbon fibers. The magnitude of the ratio was in order to X-, C-, I-, Y-, and R-type.
− General purpose PAN-based carbon fibers were heat treated up to 1500 o C, and analyzed their carbon contents, crstallinity, and crystalline size(Lc). Exothermic characteristics of carbon fiber were investigated in relation to crystallinity, and crystalline size(Lc). Carbon contents, crystallinities, and crystalline size(Lc) of PAN-based carbon fibers increased from 37.08 to 53.69%, and 1.62 to 1.82 nm, respectively as the increase of heat treatment temperature from 1000 o C to 1500 o C. Initial surface temperature of fiber tow also linearly increased as the increase of crystallinity, and crystalline size(Lc). Therefore, the crystallinity and crystal size(Lc) of carbon fibers can indirectly and rapidly be estimated by measuring the surface temperature increase.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.