Modification of carbonaceous liquid crystal by blending polymer liquid crystal

在煤焦油中间相沥青中加入5wt%或10wt%的聚苯醚，在氧化稳定化前增强沥青纤维，以获得更好的手感性能。即使在-350ﾟC的纺丝温度下，聚苯醚是可熔的，但在中间相沥青中几乎不溶解，但共混沥青可以顺利纺制成直径10微米的沥青纤维，母沥青也是如此。直径小于1微米的聚苯醚纤维均匀地分散在沥青纤维中，沿纤维轴排列。这种纤维状的聚苯醚相当大地增强了沥青纤维。碳化纤维经250ﾟC氧化后，纤维中心的纤维物质在1300ﾟC时消失，但在纤维的皮肤区观察到一些较短的纤维物质，这表明聚苯醚与纤维中心的中间相沥青共碳化，氧化的影响可能相当有限。炭化后沥青的氧化活性和机械强度略低于母体中间相沥青。

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.