Mechanically-induced dimensional extensibility of fibers towards tough fiber networks

Alexey Khakalo, Alexey Vishtal, Elias Retulainen, Ilari Filpponen, Orlando, J. Rojas

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

The beneficial effect of materials with high aspect ratio as composite reinforcement has prompted continuous interest towards cellulosic fibers. Besides providing stiffness, fibers can potentially contribute to composite extensibility. While mechanical treatments are typically used to adjust the physical and surface properties of fibers, less is known about ensuing effects on their extensibility and that of associated networks. Fiber network dimensional extensibility of 16% was achieved by processing the precursor aqueous fiber dispersions following a simple mechanical treatment with a judicious combination of low (PFI refining) and high concentrations and temperatures (Wing defibrator). Consequently, deformation of fibers and increased inter-fiber bonding resulted in a three-fold increase in strength to rupture of the fiber network leading to the structures with unprecedented toughness.
Original languageEnglish
Pages (from-to)191-205
Number of pages15
JournalCellulose
Volume24
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Fibers
Fiber bonding
Composite materials
Dispersions
Refining
Toughness
Surface properties
Aspect ratio
Reinforcement
Physical properties
Stiffness
Processing
Temperature

Keywords

  • cellulose
  • composites
  • deformation
  • extensibility
  • fibers
  • formability
  • mechanical treatment
  • packaging
  • thermoforming

Cite this

Khakalo, Alexey ; Vishtal, Alexey ; Retulainen, Elias ; Filpponen, Ilari ; Rojas, Orlando, J. / Mechanically-induced dimensional extensibility of fibers towards tough fiber networks. In: Cellulose. 2017 ; Vol. 24, No. 1. pp. 191-205.
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Mechanically-induced dimensional extensibility of fibers towards tough fiber networks. / Khakalo, Alexey; Vishtal, Alexey; Retulainen, Elias; Filpponen, Ilari; Rojas, Orlando, J.

In: Cellulose, Vol. 24, No. 1, 01.01.2017, p. 191-205.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Khakalo, Alexey

AU - Vishtal, Alexey

AU - Retulainen, Elias

AU - Filpponen, Ilari

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AB - The beneficial effect of materials with high aspect ratio as composite reinforcement has prompted continuous interest towards cellulosic fibers. Besides providing stiffness, fibers can potentially contribute to composite extensibility. While mechanical treatments are typically used to adjust the physical and surface properties of fibers, less is known about ensuing effects on their extensibility and that of associated networks. Fiber network dimensional extensibility of 16% was achieved by processing the precursor aqueous fiber dispersions following a simple mechanical treatment with a judicious combination of low (PFI refining) and high concentrations and temperatures (Wing defibrator). Consequently, deformation of fibers and increased inter-fiber bonding resulted in a three-fold increase in strength to rupture of the fiber network leading to the structures with unprecedented toughness.

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