Influences of solution state on the formation of polyvinyl alcohol as-spun fiber during dry-wet gel spinning

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• 作者：Erpeng Jia ; Ling Su ; Pengqing Liu ; Guangdou Ye ; Jianjun Xu
• 关键词：Polyvinyl alcohol solutions and fibers ; Orientation ; Entanglement ; Matter exchange
• 刊名：Fibers and Polymers
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：16
• 期：9
• 页码：1964-1969
• 全文大小：332 KB
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• 作者单位：Erpeng Jia (1)
  Ling Su (1)
  Pengqing Liu (1)
  Guangdou Ye (1)
  Jianjun Xu (1)
  
  1. State Key Laboratory of Polymer Materials Engineering of China, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  
• 出版者：The Korean Fiber Society
• ISSN：1875-0052

文摘

The polyvinyl alcohol (PVA) as-spun fibers were prepared by dry-wet gel spinning, with dimethylsulfoxide (DMSO) as solvent and methanol as the cooling medium. The rheological properties of spinning solutions, matter exchanges, sonic orientation factor and entanglement of PVA as-spun fibers were investigated. Solution with lower PVA content at lower temperature has a same viscosity with the more concentrated solution at higher temperature. Solution with lower concentration has a higher G-and a lower Tan δ, which leads to a lower sonic orientation factor for the fiber. The calculating results from the optical microscope show that solution with lower PVA content loses less DMSO due to the weaker gel ability and the possible phase separation during the coagulation. Moreover, solution more closed to the gel point bounds more DMSO, which makes the DMSO exchange difficult to process. The entanglement in the as-spun fiber decreases with the decreasing PVA content in the solution. Suitable crystallization and entanglement can obtain fibers with higher strength. Keywords Polyvinyl alcohol solutions and fibers Orientation Entanglement Matter exchange