Modification of carbonaceous liquid crystal by blending polymer liquid crystal

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Polyphenyleneoxide was blended in amounts of 5 or 10 wt% into coal tar derived mesophase pitch to reinforce the pitch fiber before the oxidative stabilization to achieve better handling properties. Although polyphenyleneoxide was fusible but hardly soluble in the mesophase pitch even at a spinning temperature of -350ﾟC,blended pitch could be smoothly spun into pitch fiber 10micrometer diameter, as could the parent pitch. Fibrous polyphenyleneoxide of less than 1micrometer diameter was homogenously dispersed in the pitch fiber, being arranged along the fiber axis. Such fibrous polyphenyleneoxide reinforced the pitch fiber considerably. The fibrous substances at the center of the fiber disappeared in the carbonized fiber at 1300ﾟC after the oxidation at 250ﾟC,although some short ones were observed in the skin region of the fiber, suggesting that polyphenyleneoxide was co-carbonized to be assimilated with mesophase pitch at the center of the fiber, where the effects of oxidation may be rather limited. The oxidation reactivity and its mechanical strength after carbonization were slightly lower in comparison with those of the parent mesophase pitch.