利用同步辐射X射线小角散射(SAXS)研究了黏胶基碳纤维原丝裂解过程中微孔的变化.结果表明:裂解过程中微孔沿轴向的半径由3.88 nm逐渐增大到7.04 nm,而垂直于轴向的半径则由3.86 nm减小至3.15 nm.因而,孔形由椭圆逐渐演变成针形,且取向趋向于纤维轴方向.分形研究表明:垂直于轴向的微孔分形维数由2.40增大到2.61,而沿轴向的微孔分形维数则在2.00 ～2.23波动,说明随着裂解的进行,微孔结构逐渐趋于复杂化.微孔是影响纤维的力学性能主要因素,对纤维中的微孔结构的研究有着重要意义.
参考文献
| [1] | Ruland W .Carbon fibers[J].Advanced Materials,1990,2(11):528-536. |
| [2] | 葛曷一,陈娟,柳华实,王成国.聚丙烯腈预氧化纤维碳化中的结构演变与碳纤维微观结构[J].化工学报,2009(01):238-243. |
| [3] | Marilyn L. Minus;Satish Kumar .The Processing, Properties, and Structure of Carbon Fibers[J].JOM,2005(2):52-58. |
| [4] | He Fu.Carbon fiber and its application technology[M].Beijing:Cheical Industry Press,2004 |
| [5] | Tang M;Bacon R .Carbonization of cellulose fibers-Ⅰ.Low temperature pyrolysis[J].Carbon,1964,2(3):211-220. |
| [6] | Bacon R;Tang M .Carbonization of cellulose fibers-Ⅱ.Physical property study[J].Carbon,1964,2(3):221-225. |
| [7] | Miyoshi Kaburagi;Yuezhen Bin;Dan Zhu;Masaru Matsuo .Small angle x-ray scattering from voids within fibers during the stabilization and carbonization stages[J].Carbon: An International Journal Sponsored by the American Carbon Society,2003(5):915-926. |
| [8] | Thunemann AF.;Ruland W. .Lamellar mesophases in polyacrylonitrile: A synchrotron small-angle X-ray scattering study[J].Macromolecules,2000(7):2626-2631. |
| [9] | Ruland W.Small-angle scattering studies on carbonized cellulose fibers[A].,1969:143-151. |
| [10] | Takayuki Kobayashi;Kazunori Sumiya;Yoshinori Fukuba .Structural heterogeneity and stress distribution in carbon fiber monofilament as revealed by synchrotron micro-beam X-ray scattering and micro-Raman spectral measurements[J].Carbon: An International Journal Sponsored by the American Carbon Society,2011(5):1646-1652. |
| [11] | Li Denghua;Wu Gangping;Lv Chunxiang et al.Evolution of microvoids in PAN-based carbon fiber[J].New Carbon Materials,2010,25(1):41-47. |
| [12] | Guansen Jiang;Weifeng Huang;Lin Li .Structure and properties of regenerated cellulose fibers from different technology processes[J].Carbohydrate Polymers: Scientific and Technological Aspects of Industrially Important Polysaccharides,2012(3):2012-2018. |
| [13] | Perret R;Ruland W .Single and multiple X-ray smallangle scattering of carbon fibres[J].Journal of Applied Crystallography,1969,2(5):209-218. |
| [14] | Thunemann AF.;Ruland W. .Microvoids in polyacrylonitrile fibers: A small-angle X-ray scattering study[J].Macromolecules,2000(5):1848-1852. |
| [15] | Caizhen Zhu;Xiaofang Liu;Xiaolan Yu .A small-angle X-ray scattering study and molecular dynamics simulation of microvoid evolution during the tensile deformation of carbon fibers[J].Carbon: An International Journal Sponsored by the American Carbon Society,2012(1):235-243. |
| [16] | Wang Qifen .Structure and structure formation process of polyacrylonitrile fibers[D].Shandong University,2010. |
| [17] | Chen Yuhan;Wu QIlin;Pan Ding .Fractional features of different celllulose precursors and their carbon fibers[J].Carbon,2006,3(127):19-23. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%