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A Sequential Debonding Fracture Model for Hydrogen-Bonded Hydrogels

Journal Article


Abstract


  • Hydrogen bonds are known to play an important role in prescribing the mechanical performance of certain hydrogels such as polyether-based polyurethanes. The quantitative contribution of hydrogen bonds to the toughness of polymer networks, however, has not been elucidated to date. Here, a new physical model is developed to predict the threshold fracture energies of hydrogels physically crosslinked via hydrogen bonds. The model is based on consecutive and sequential dissociation of hydrogen-bonded crosslinks during crack propagation. It is proposed that the scission of hydrogen bonds during crack propagation allows polymer strands in the deformation zone to partially relax and release stored elastic energy. The summation of these partial chain relaxations leads to amplified threshold fracture energies which are 10–45 times larger than those predicted by the classical Lake–Thomas theory. Experiments were performed on a hydrophilic polyurethane hydrogel where urea additions were used to control the density of hydrogen bonds. The measured fracture energies were in good agreement with the calculated values. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018.

UOW Authors


  •   Xin, Hai (external author)
  •   Oveissi, Farshad (external author)
  •   Naficy, Sina (external author)
  •   Spinks, Geoff M. (external author)

Publication Date


  • 2018

Citation


  • Xin, H., Oveissi, F., Naficy, S. & Spinks, G. M. (2018). A Sequential Debonding Fracture Model for Hydrogen-Bonded Hydrogels. Journal of Polymer Science Part B: Polymer Physics, 56 (19), 1287-1293.

Scopus Eid


  • 2-s2.0-85052788773

Number Of Pages


  • 6

Start Page


  • 1287

End Page


  • 1293

Volume


  • 56

Issue


  • 19

Place Of Publication


  • United States

Abstract


  • Hydrogen bonds are known to play an important role in prescribing the mechanical performance of certain hydrogels such as polyether-based polyurethanes. The quantitative contribution of hydrogen bonds to the toughness of polymer networks, however, has not been elucidated to date. Here, a new physical model is developed to predict the threshold fracture energies of hydrogels physically crosslinked via hydrogen bonds. The model is based on consecutive and sequential dissociation of hydrogen-bonded crosslinks during crack propagation. It is proposed that the scission of hydrogen bonds during crack propagation allows polymer strands in the deformation zone to partially relax and release stored elastic energy. The summation of these partial chain relaxations leads to amplified threshold fracture energies which are 10–45 times larger than those predicted by the classical Lake–Thomas theory. Experiments were performed on a hydrophilic polyurethane hydrogel where urea additions were used to control the density of hydrogen bonds. The measured fracture energies were in good agreement with the calculated values. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018.

UOW Authors


  •   Xin, Hai (external author)
  •   Oveissi, Farshad (external author)
  •   Naficy, Sina (external author)
  •   Spinks, Geoff M. (external author)

Publication Date


  • 2018

Citation


  • Xin, H., Oveissi, F., Naficy, S. & Spinks, G. M. (2018). A Sequential Debonding Fracture Model for Hydrogen-Bonded Hydrogels. Journal of Polymer Science Part B: Polymer Physics, 56 (19), 1287-1293.

Scopus Eid


  • 2-s2.0-85052788773

Number Of Pages


  • 6

Start Page


  • 1287

End Page


  • 1293

Volume


  • 56

Issue


  • 19

Place Of Publication


  • United States