Alignment-Improved and Diameter-Reduced Electrospun Polymer Fibers via the Hot-Stretching Process

Hsun Hao Hsu, Yu Jing Chiu, Jia Wei Li, Hsiao Fan Tseng, Kai Chieh Chang, Jiun-Tai Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Electrospinning is one of the most facile and versatile techniques to prepare polymer fibers ranging from micrometers to nanometers. Although several parameters can be tuned to control the sizes and morphologies of electrospun fibers, many obstacles are still encountered as the target sizes of the fibers are getting smaller; for example, the sizes of the fibers can be effectively reduced by lowering the polymer solution concentrations but beaded or beads-on-string structures are usually formed. To overcome such obstacles, here a simple technique to prepare alignment-improved and diameter-reduced fibers without bead formation by hot-stretching electrospun fibers at temperatures higher than the glass transition temperatures of the polymers is developed. Polystyrene and poly(methyl methacrylate) are both used in this work as model materials. The relationship between the draw ratio and diameter of the fibers is quantitatively analyzed, demonstrating the control of the fiber diameters. Moreover, higher degrees of alignment improvement at the middle part of the fibers than those at the end part is observed, which results in lower water contact angles at the middle part of the fibers. This work provides a useful post-treatment technique to control the sizes and orientations of electrospun polymer fibers.

Original languageEnglish
Article number1900637
JournalMacromolecular Materials and Engineering
Volume305
Issue number2
DOIs
StatePublished - 1 Feb 2020

Keywords

  • contact angles
  • diameter reduction
  • electrospinning
  • hot-stretching
  • orientation dispersion

Fingerprint Dive into the research topics of 'Alignment-Improved and Diameter-Reduced Electrospun Polymer Fibers via the Hot-Stretching Process'. Together they form a unique fingerprint.

Cite this