High Strength and High Modulus Electrospun Nanofibers

This paper presents an in-depth review of the mechanical properties of electrospun fibers and focuses on methodologies to generate high strength and high modulus nanofibers

Jian Yao; Cees Bastiaansen; Ton Peijs

2014

Scholarcy highlights

  • Over the last two decades, a relatively old technique, electrospinning, has been receiving renewed interest due to its huge potential of producing polymer nanofibers
  • With respect to the vast amount of research on other electrospun nanofibers based on flexible chain polymers such as aliphatic polyamide and polyester, a relatively limited number of studies involved the mechanical properties of non-woven nanofiber mats or even single nanofibers
  • As relaxation times of flexible chain polymers are typically very short, orientation induced in the initial spinning process may rapidly disappear before solidification. It is for this reason that conventional high performance fibers based on flexible chain polymers are post-drawn in the solid state below the melting temperature as this will prevent chain relaxation after orientation
  • The mechanical properties of these nanofibers are often well below those of fibers made by conventional processes such melt- or solution spinning
  • The main reason for this being the competition between flow-induced chain orientation and chain relaxation before fiber solidification, leading to low degrees of molecular orientation in as-spun fibers
  • In order to achieve similar high levels of chain orientation and chain extension in nanofibers based on flexible chain polymers it is vital to apply a post-stretching step

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