Self-Healing Nanofiber-Reinforced Polymer Composites. 1. Tensile Testing and Recovery of Mechanical Properties

Min Wook Lee, Seongpil An, Hong Seok Jo, Suk Goo Yoon, Alexander Yarin

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The present work aims at development of self-healing materials capable of partially restoring their mechanical properties under the conditions of prolonged periodic loading and unloading, which is characteristic, for example, of aerospace applications. Composite materials used in these and many other applications frequently reveal multiple defects stemming from their original inhomogeneity, which facilitates microcracking and delamination at ply interfaces. Self-healing nanofiber mats may effectively prevent such damage without compromising material integrity. Two types of core-shell nanofibers were simultaneously electrospun onto the same substrate in order to form a mutually entangled mat. The first type of core-shell fibers consisted of resin monomer (dimethylsiloxane) within the core and polyacrylonitrile within the shell. The second type of core-shell nanofibers consisted of cure (dimethyl-methyl hydrogen-siloxane) within the core and polyacrylonitrile within the shell. These mutually entangled nanofiber mats were used for tensile testing, and they were also encased in polydimethylsiloxane to form composites that were also subsequently subjected to tensile testing. During tensile tests, the nanofibers can be damaged in stretching up to the plastic regime of deformation. Then, the resin monomer and cure was released from the cores and the polydimethylsiloxane resin was polymerized, which might be expected to result in the self-healing properties of these materials. To reveal and evaluate the self-healing properties of the polyacrylonitrile-resin-cure nanofiber mats and their composites, the results were compared to the tensile test results of the monolithic polyacrylonitrile nanofiber mats or composites formed by encasing polyacrylonitrile nanofibers in a polydimethylsiloxane matrix. The latter do not possess self-healing properties, and indeed, do not recover their mechanical characteristics, in contrast to the polyacrylonitrile-resin-cure nanofiber mats and the composites reinforced by such mats. This is the first work, to the best of our knowledge, where self-healing nanofibers and composites based on them were developed, tested, and revealed restoration of mechanical properties (stiffness) in a 24 h rest period at room temperature.

Original languageEnglish
Pages (from-to)19546-19554
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number35
DOIs
Publication statusPublished - 2015 Sep 9

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Tensile testing
Nanofibers
Polymers
Polyacrylonitriles
Recovery
Mechanical properties
Composite materials
Resins
Polydimethylsiloxane
Self-healing materials
Monomers
Dimethylpolysiloxanes
Siloxanes
Microcracking
Aerospace applications
Unloading
Delamination
Restoration
Stretching
polyacrylonitrile

Keywords

  • composite
  • core-shell nanofibers
  • electrospinning
  • self-healing
  • tensile

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Self-Healing Nanofiber-Reinforced Polymer Composites. 1. Tensile Testing and Recovery of Mechanical Properties. / Lee, Min Wook; An, Seongpil; Jo, Hong Seok; Yoon, Suk Goo; Yarin, Alexander.

In: ACS Applied Materials and Interfaces, Vol. 7, No. 35, 09.09.2015, p. 19546-19554.

Research output: Contribution to journalArticle

Lee, Min Wook ; An, Seongpil ; Jo, Hong Seok ; Yoon, Suk Goo ; Yarin, Alexander. / Self-Healing Nanofiber-Reinforced Polymer Composites. 1. Tensile Testing and Recovery of Mechanical Properties. In: ACS Applied Materials and Interfaces. 2015 ; Vol. 7, No. 35. pp. 19546-19554.
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