Structures and mechanical properties of plied and twisted polyacrylonitrile nanofiber yarns fabricated by a multi-needle electrospinning device

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• 作者：Tao Yan ; Long Tian ; Zhijuan Pan
• 关键词：Electrospinning ; PAN ; Nanofiber yarn ; Multi ; needle ; Mechanical properties
• 刊名：Fibers and Polymers
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：17
• 期：10
• 页码：1627-1633
• 全文大小：1,373 KB
• 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
• 卷排序：17

文摘

Polyacrylonitrile (PAN) nanofiber filaments were manufactured continuously for several hours by a homemade multi-needle electrospinning device. The yarns were continuously obtained by plying and twisting nanofiber filaments using a self-made twisting device. The structures and mechanical properties of yarns were investigated. The influences of twist setting temperatures and periods of time on morphology and mechanical properties were discussed. The results showed that the alignment degree of nanofibers along the filament axis could reach 70.9 %. The twist angle increased with increasing twists and the number of filaments. With increasing twists, the breaking stress and strain increased initially and then decreased; the maximum breaking stress and strain were 34.7 MPa and 26.1 %, respectively; the initial modulus decreased with increasing twists and plies, the maximum modulus was 391.3 MPa. Both the breaking stress and strain increased with the increase of twist setting temperatures and times. The optimal setting temperature and time were 90 °C and 30 min, respectively, the maximum breaking stress and strain were 32.8 MPa and 20.8 %, meanwhile, the crystallinity improved from 34.5 % to 39.9 %. This study demonstrates the possibility of continuously and stably manufacturing PAN nanofiber yarns.