用差示扫描量热仪(DSC)研究了聚丙烯腈/衣糠酸共聚物纤维在氧化性气氛(空气)和非氧化性气氛(氩气)下环化反应和氧化反应受升温速率的影响,分析了这两种反应之间的相互作用和反应机理;结合傅里叶红外光谱(FTIR)对DSC回收样品的分析研究了环化反应的诱导期.结果表明,环化反应的引发存在一定的诱导期,升温速率越快,诱导期越长;在缓慢升温条件下,氧的充分扩散使一部分氧化反应与环化反应可以同时进行;在预氧化初期,氧化性气氛具有引发环化反应、缩短环化反应诱导期的作用,而在预氧化后期则阻碍环化,这种阻碍作用随着升温速率的提高而逐渐减弱.
参考文献
| [1] | 贺福.碳纤维及其应用技术[M].北京:化学工业出版社,2004 |
| [2] | S. CHAND .Review Carbon fibers for composites[J].Journal of Materials Science,2000(6):1303-1313. |
| [3] | 刘国昌,徐淑琼.聚丙烯腈基碳纤维及其应用[J].机械制造与自动化,2004(04):41-43. |
| [4] | STANDAGE A E;MATKOWSKY R D .Thermal oxidation of polyacrylonitrile[J].European Polymer Journal,1971,7(07):775-783. |
| [5] | A. GUPTA;I. R. HARRISON .NEW ASPECTS IN THE OXIDATIVE STABILIZATION OF PAN-BASED CARBON FIBERS[J].Carbon: An International Journal Sponsored by the American Carbon Society,1996(11):1427-1445. |
| [6] | 井敏,王成国,朱波,王延相,丁海燕.PAN原丝预氧化工艺与氧元素含量相关性研究[J].航空材料学报,2006(05):56-60. |
| [7] | Bahrami SH.;Bajaj P.;Sen K. .Thermal behavior of acrylonitrile carboxylic acid copolymers[J].Journal of Applied Polymer Science,2003(3):685-698. |
| [8] | Devasia R;Nair CPR;Sadhana R;Babu NS;Ninan KN .Fourier transform infrared and wide-angle X-ray diffraction studies of the thermal cyclization reactions of high-molar-mass poly(acrylonitrile-co-itaconic acid)[J].Journal of Applied Polymer Science,2006(4):3055-3062. |
| [9] | 刘杰,李佳,王雷,梁节英.预氧化温度对聚丙烯腈纤维皮芯结构形成的影响[J].北京化工大学学报（自然科学版）,2006(01):41-45. |
| [10] | Gupta AK.;Bajaj P.;Paliwal DK. .EFFECT OF AN ACIDIC COMONOMER ON THERMOOXIDATIVE STABILIZATION OF POLYACRYLONITRILE[J].Journal of Applied Polymer Science,1995(7):1161-1174. |
| [11] | WATT W;JOHNSON W .Mechanism of oxidation of polyacrylonitrile fibers[J].Nature,1975,257:210-212. |
| [12] | 张利珍,吕春祥,吕永根,吴刚平,贺福.聚丙烯腈纤维在预氧化过程中的结构和热性能转变[J].新型炭材料,2005(02):144-150. |
| [13] | Wangxi ZHANG,Jie LIU,Jieying LIANG.New Evaluation on the Preoxidation Extent of Different PAN Precursors[J].材料科学技术学报(英文版),2004(04):369-372. |
| [14] | Kakida H.;Tashiro K. .MECHANISM AND KINETICS OF STABILIZATION REACTIONS OF POLYACRYLONITRILE AND RELATED COPOLYMERS .3. COMPARISON AMONG THE VARIOUS TYPES OF COPOLYMERS AS VIEWED FROM ISOTHERMAL DSC THERMOGRAMS AND FT-IR SPECTRAL CHANGES[J].Polymer Journal,1997(7):557-562. |
| [15] | Hou C;Qun W;Qu RJ;Wang CG .Kinetic study of the degradation of acrylonitrile-acrylamide copolymers[J].Journal of Applied Polymer Science,2005(4):1017-1020. |
| [16] | COLLINS G L;THOMAS N W;WILLIAMS G E .Kinetic relationships between heat generation and nitrile consumption in the reaction of poly (acrylonitrile) in air at 265℃[J].CARBO,1988,26(05):671-679. |
| [17] | Beltz LA.;Gustafson RR. .CYCLIZATION KINETICS OF POLY(ACRYLONITRILE)[J].Carbon: An International Journal Sponsored by the American Carbon Society,1996(5):561-566. |
| [18] | Yu MJ;Wang CG;Bai YJ;Xu Y;Zhu B .Effect of oxygen uptake and aromatization on the skin-core morphology during the oxidative stabilization of polyacrylonitrile fibers[J].Journal of Applied Polymer Science,2008(3):1939-1945. |
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