Modification of carbonaceous liquid crystal by blending polymer liquid crystal

共混聚合物液晶对碳质液晶的改性

• 批准号: 05650860
• 负责人: KORAI Yozo
• 金额: $ 1.41万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650860/
• 关键词: pitch based carbon fiber; carbonaceous liquid cryst.; nematic liquid crystal; tensile strength; polymer liquid crystal; carbonization; mutual solubility; tensile modulas; ピッチ; 炭素繊維; 液晶; メソフェーズピッチ; 共炭化; 合成ピッチ; ネスティック液晶

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.

在氧化稳定化之前，将聚氧化亚苯基醚以5或10wt%的量共混到煤焦油衍生的中间相沥青中以增强沥青纤维，以实现更好的处理性能。在纺丝温度为-350 ° C时，虽然聚苯醚在中间相沥青中易熔但难溶，但共混沥青与母体沥青一样，可顺利纺成直径为10 μ m的沥青纤维。直径小于1 μ m的纤维状聚苯醚均匀分散在沥青纤维中，沿纤维轴向沿着。这种纤维状的聚氧化亚苯基醚显著地增强了沥青纤维。在250 ℃氧化后，在1300 ℃时，纤维中心的纤维状物质消失，但在纤维的表皮区仍有少量短纤维状物质，说明在纤维中心，环氧苯乙烷与中间相沥青发生了共混同化，氧化的影响可能相当有限。与母体中间相沥青相比，中间相沥青的氧化反应性和碳化后的机械强度略低。

项目成果

I.Mochida,L.Ling,Y.Korai: "Some factors for the high performances of mesophase pitch based carbon fibre" Journal of Materials Science. 29. 3050-3056 (1994)

I.Mochida，L.Ling，Y.Korai：“中间相沥青基碳纤维高性能的一些因素”材料科学杂志。

I.Mochida, S.H.Yoon, Y.Korai: "Control of transversal texture in circular mesophase pitchbased carbon fiber using non-circular spinning nozzles" Journal of Materials Science. Vol.28. 2331-2336 (1993)

I.Mochida、S.H.Yoon、Y.Korai：“使用非圆形纺丝喷嘴控制圆形中间相沥青基碳纤维的横向织构”材料科学杂志。

Yozo Korai: "Microtexture of trans'versal sections of carbon fiber" 21th Biennal Conference on Carbon Abstract. 248-249 (1993)

Yozo Korai：“碳纤维横向截面的微观纹理”第 21 届碳摘要双年会议。

I.Mochida, L.Ling, Y.Korai: "Some factors for the high performances of mesophase pitch based.carbon fiber" Journal of Materials Science. Vol.29. 3050-3056 (1994)

I.Mochida、L.Ling、Y.Korai：“中间相沥青基碳纤维高性能的一些因素”材料科学杂志。

S.H.Yoon, Y.Korai, I.Mochida, I.Kato: "The flow properties of mesophase pitches derived from methylnaphthalene and naphthalene in the temperature range of their spinning" Carbon. Vol.32. 273-280 (1994)

S.H.Yoon、Y.Korai、I.Mochida、I.Kato：“甲基萘和萘衍生的中间相沥青在纺丝温度范围内的流动特性”碳。