文章摘要
木质素-丙烯腈共聚物纤维热稳定化过程中的直径尺寸效应
Diameter Size Effect of Lignin-Acrylonitrile Copolymer Fibers During Thermal Stabilization
  
DOI:10.16865/j.cnki.1000-7555.2017.11.013
中文关键词: 木质素  碳纤维  热稳定化  直径尺寸效应
英文关键词: lignin  carbon fiber  thermal stabilization  diameter size effect
基金项目:国家自然科学基金资助项目(21404111)
作者单位
刘大鹏1,2, 欧阳琴1, 江雪峰1, 皇 静1, 马洪波1, 陈友汜1 1. 中国科学院宁波材料技术与工程研究所 碳纤维制备技术国家工程实验室浙江 宁波 3152012. 中国科学技术大学 纳米科学与技术学院江苏 苏州 215123 
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中文摘要:
      通过酯化反应和自由基共聚反应制备了具有良好可纺性的木质素-丙烯腈(LS-AN)共聚物,采用湿法纺丝工艺制备了3种不同直径的LS-AN共聚物纤维,然后在梯度升温模式下对其进行热稳定化处理,采用差示扫描量热仪、红外光谱仪、密度梯度仪研究了LS-AN共聚物纤维热稳定化过程中的直径尺寸效应。结果表明:在空气气氛中,减小直径能够显著促进热稳定化反应的进行;减小纤维直径有利于氧向纤维内部扩散,促进氧化反应的进行,从而获得均质的径向稳定化结构;减小纤维直径可以显著提高碳纤维的力学性能,由直径最小的LS-AN共聚物纤维制得了拉伸强度和拉伸模量分别达到849 MPa和146 GPa的碳纤维。
英文摘要:
      A lignin-acrylonitrile (LS-AN) copolymer with good spinnability was prepared through esterification reaction and free radical copolymerization reaction. Three LS-AN copolymer fibers with different diameter were prepared through wet spinning technique, and then thermal stabilization process was carried out under a gradient heating model. Effect of fiber diameter on the thermal stabilization of LS-AN copolymer fibers was studied through differential scanning calorimetry, infrared spectroscopy and density gradient apparatus. In the air, reducing the diameter can significantly promote the thermal stabilization reactions of the LS-AN copolymer fibers; reducing the diameter is beneficial for diffusion of oxygen into the fiber, which can promote the oxidation reaction, so as to obtain a homogeneous radial stabilized structure; the mechanical properties of carbon fibers are significantly improved by reducing the fiber diameter. Carbon fibers with the tensile strength and tensile modulus up to 849 MPa and 146 GPa, respectively, are prepared with the LS-AN copolymer fibers of the smallest diameter.
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