Modification of carbonaceous liquid crystal by blending polymer liquid crystal

在煤焦油衍生的中间相沥青中掺入5%或10%的聚苯乙烯，在氧化稳定之前增强沥青纤维，以获得更好的处理性能。在-350℃的纺丝温度下，聚苯二甲酸酯在中间相沥青中虽易熔但难溶，但可纺成直径为10微米的沥青纤维。直径小于1微米的纤维状聚苯乙烯氧化物均匀地分散在沥青纤维中，沿纤维轴排列。这种纤维型聚苯乙烯氧化物对沥青纤维有很大的增强作用。在250ºC氧化后，1300ºC的炭化纤维中，纤维中心的纤维物质消失，但在纤维的表皮区域出现了一些短的纤维物质，说明聚苯乙烯在炭化过程中与纤维中心的中间相沥青发生了共炭化，氧化作用有限。碳化后的氧化反应性和机械强度略低于中间相沥青。

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.