Effect of annealing on the crystallization and properties of electrospun polylatic acid and nylon 6 fibers

Ah Ra Cho, Dong Myeong Shin, Hyun Wook Jung, Jae Chun Hyun, Joo Sung Lee, Daehwan Cho, Yong Lak Joo

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Electrospinning experiments for solutions of two polymers with different crystallization rates, polylatic acid (PLA), and nylon 6 solutions have been carried out. Hexafluoroisopropanol (HFIP) was used as a common solvent to dissolve both PLA and nylon 6. Using the fact that nylon 6 has the faster crystallization rate than PLA, the effect of thermal annealing conditions on the crystal structures of two electrospun fibers has mainly been studied via thermal and mechanical analysis. First, optimal conditions for the formation of uniform nanofibers have been determined by observing their morphology and rheological properties. Thermal analysis revealed that PLA as-spun fiber exhibits cold crystallization due to insufficient crystal growth in spinline. Also, the effect of thermal annealing on the structural change of nylon 6 fibers including the degree of flow-induced crystallization is totally different from that of PLA fibers. Finally, tensile measurements of annealed fibers show that the ultimate tensile strength and Young's modulus gradually increases with increasing annealing time for both PLA and nylon 6 mats, resulting from the further growth of crystal structures.

Original languageEnglish
Pages (from-to)752-758
Number of pages7
JournalJournal of Applied Polymer Science
Volume120
Issue number2
DOIs
Publication statusPublished - 2011 Apr 15

Keywords

  • PLA
  • annealing
  • crystal structure
  • mechanical properties
  • nylon 6
  • solution electrospinning
  • thermal properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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