Research on PAN Nascent Fiber Interior Microstructure through Ultrasonic Etching and Ultrathin Sectioning |
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Authors: | Quan Gao Min Jing Meiling Chen Chengguo Wang Shengyao Zhao Jianjie Qin |
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Institution: | 1.Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials (Ministry of Education),Shandong University,Jinan,China;2.School of Material Science and Engineering,Shandong Jianzhu University,Jinan,China |
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Abstract: | The interior microstructures of polyacrylonitrile nascent fibers is studied by the scanning electronic microscopy and the high-resolution transmission electron microscopy through ultrasonic etching and ultrathin sectioning. Due to the orientation and fold of molecular chains, the lamellae of 50–80 nm in thickness are formed. A high number of pores, ranging from dozens to two hundred nanometers in diameters exist between the lamellae, which result from residual solvent. The fibril structure is formed in the nascent fiber during the coagulation process, which are oriented along the fiber axis. An uneven tensile stress distribution leads to the formation of skin-core structures in the nascent fiber during the dry-jet wet spinning process. |
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