Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process
文献类型：期刊论文
| 作者 | Lin, JY
|
| 刊名 | RSC ADVANCES
 |
| 出版日期 | 2014 |
| 卷号 | 4期号:84页码:44666—44673 |
| 关键词 | REGENERATED CELLULOSE FIBERS HIGH-PERFORMANCE FIBERS X-RAY-SCATTERING MECHANICAL-PROPERTIES FILMS DEFORMATION POLYMERS |
| ISSN号 | 2046-2069 |
| 通讯作者 | qhzhang@dhu.edu.cn |
| 英文摘要 | The development of crystalline structure and morphology for polyimide (PI) fibers in the heat-drawing process was investigated by simultaneous synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). WAXD results indicated that the drawing process resulted in a high crystal orientation and ordered crystal structure. Especially, as the drawing ratio increases to 2.0, a well-defined crystalline structure forms in the fibers. We propose that the highly oriented molecular chains induce the formation of crystalline regions. Namely, an orientation-induced crystallization occur with stretching in the case of the heat-drawing polyimide fibers. The meridional scattering streaks in the SAXS patterns for the as-spun fibers suggest the presence of periodic lamellar structure in the fibers. These crystalline lamellae may evolve to more complete crystalline regions. The size of microvoids in the cross-section of the PI fibers is analyzed by SAXS. As a result, the drawing process leads to the orientation of microvoids along the fiber, and to reduced diameter of the microvoids in the fiber. Dynamic thermomechanical analysis indicates that the activation energy E-a of alpha relaxation increases with the increase in the crystallinity and orientation in the fibers. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000342993800049 |
| 公开日期 | 2015-03-13 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/14124]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 推荐引用方式 GB/T 7714 | Lin, JY. Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process[J]. RSC ADVANCES,2014,4(84):44666—44673. |
| APA | Lin, JY.(2014).Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process.RSC ADVANCES,4(84),44666—44673. |
| MLA | Lin, JY."Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process".RSC ADVANCES 4.84(2014):44666—44673. |
入库方式： OAI收割
来源：上海应用物理研究所
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