PAN原丝取向行为与初生纤维结构的相关性

阮如玉 徐德华 梁子 徐樑华

阮如玉, 徐德华, 梁子, 徐樑华. PAN原丝取向行为与初生纤维结构的相关性[J]. 航空材料学报, 2019, 39(1): 89-95. doi: 10.11868/j.issn.1005-5053.2017.000211
引用本文: 阮如玉, 徐德华, 梁子, 徐樑华. PAN原丝取向行为与初生纤维结构的相关性[J]. 航空材料学报, 2019, 39(1): 89-95. doi: 10.11868/j.issn.1005-5053.2017.000211
Ruyu RUAN, Dehua XU, Zi LIANG, Lianghua XU. Correlation between orientation behavior of polyacrylonitrile precursor and structure of nascent fiber[J]. Journal of Aeronautical Materials, 2019, 39(1): 89-95. doi: 10.11868/j.issn.1005-5053.2017.000211
Citation: Ruyu RUAN, Dehua XU, Zi LIANG, Lianghua XU. Correlation between orientation behavior of polyacrylonitrile precursor and structure of nascent fiber[J]. Journal of Aeronautical Materials, 2019, 39(1): 89-95. doi: 10.11868/j.issn.1005-5053.2017.000211

PAN原丝取向行为与初生纤维结构的相关性

doi: 10.11868/j.issn.1005-5053.2017.000211
基金项目: 国家自然科学基金联合基金(U1362205)
详细信息
    通讯作者:

    徐樑华(1960—),男,教授,主要从事聚丙烯腈碳纤维的研究,(E-mail)xulh@mail.buct.edu.cn

  • 中图分类号: TQ342+.31

Correlation between orientation behavior of polyacrylonitrile precursor and structure of nascent fiber

  • 摘要: 通过改变浓度、温度等凝固浴条件,获得取向行为不同的PAN原丝,采用声速法测定原丝的取向结构,使用X射线衍射仪、光学显微镜对PAN初生纤维的聚集态结构、截面形貌进行表征,建立原丝取向与初生纤维结构的相关性。依据取向度随牵伸倍数变化对数拟合曲线的斜率,定义原丝的分子链取向能力a,研究a与初生纤维结晶度的关联性。结果表明:初生纤维结晶度越高,PAN原丝可牵伸性越小,在同一牵伸倍数下纤维全取向度越高;原丝最大牵伸倍数受初生纤维径向结构影响显著,在凝固浴浓度74%时出现极大值;高溶剂含量的纤维分子链取向能力大于低溶剂含量的纤维;原丝的分子链取向能力随初生纤维结晶度增大而增大。

     

  • 图  1  PAN原丝取向行为随凝固浴浓度变化图 (a)取向度;(b)最大牵伸倍数

    Figure  1.  Relational graph of orientation behavior with coagulation bath concentration (a)degree of orientation;(b)maximum drawing ratio

    图  2  不同凝固浴浓度下初生纤维截面的扫描照片

    Figure  2.  Cross-sections of nascent fibers under different coagulation concentrations (a)70%;(b)72%;(c)74%;(d)76%;(e)78%

    图  3  原丝取向行为和初生纤维结晶度随凝固浴浓度变化图 (a)取向度;(b)最大牵伸倍数

    Figure  3.  Graph of varition of orientation behavior of fibers and crystallinity of nascent fibers with coagulation bath concentration (a)degree of orientation;(b)maximum drawing ratio

    图  4  PAN原丝取向行为随凝固浴温度变化图 (a)取向度;(b)最大牵伸倍数

    Figure  4.  Relational graph of orientation behavior with coagulation bath temperature (a)degree of orientation;(b)maximum drawing ratio

    图  5  原丝取向行为和初生纤维结晶度随凝固浴温度变化图 (a)取向度;(b)最大牵伸倍数

    Figure  5.  Graph of varition of orientation behavior of fibers and crystallinity of nascent fibers with coagulation bath temperature (a)degree of orientation;(b)maximum drawing ratio

    图  6  凝固浴浓度为74%时不同溶剂含量原丝取向度随牵伸倍数变化图

    Figure  6.  Change of degree of orientation of fibers with different solvent contents at drawing ratio of 74%

    图  7  对数拟合纤维取向行为示意图

    Figure  7.  Diagram of logarithm fitting for orientation of fiber

    图  8  原丝分子链取向能力a和初生纤维结晶度随凝固浴温度变化图

    Figure  8.  Orientation ability of molecular chain and crystallinity of nascent fibers with coagulation bath temperature

    图  9  原丝取向度与初生纤维结晶度相关性

    Figure  9.  Relationship between orientation of fibers and crystallinity of nascent fibers

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出版历程
  • 收稿日期:  2018-01-02
  • 修回日期:  2018-02-26
  • 网络出版日期:  2019-01-21
  • 刊出日期:  2019-02-01

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