Atomic Origins of the Self-Healing Function in Cement-Polymer Composites

Manh Thuong Nguyen, Zheming Wang, Kenton A. Rod, M. Ian Childers, Carlos Fernandez, Phillip K. Koech, Wendy D. Bennett, Roger Rousseau, Vassiliki Alexandra Glezakou

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Motivated by recent advances in self-healing cement and epoxy polymer composites, we present a combined ab initio molecular dynamics and sum frequency generation (SFG) vibrational spectroscopy study of a calcium-silicate-hydrate/polymer interface. On stable, low-defect surfaces, the polymer only weakly adheres through coordination and hydrogen bonding interactions and can be easily mobilized toward defected surfaces. Conversely, on fractured surfaces, the polymer strongly anchors through ionic Ca-O bonds resulting from the deprotonation of polymer hydroxyl groups. In addition, polymer S-S groups are turned away from the cement-polymer interface, allowing for the self-healing function within the polymer. The overall elasticity and healing properties of these composites stem from a flexible hydrogen bonding network that can readily adapt to surface morphology. The theoretical vibrational signals associated with the proposed cement-polymer interfacial chemistry were confirmed experimentally by SFG vibrational spectroscopy.

Original languageEnglish
Pages (from-to)3011-3019
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number3
DOIs
Publication statusPublished - Jan 24 2018

    Fingerprint

Keywords

  • ab initio molecular simulations
  • C-S-H model
  • geothermal
  • self-healing cement
  • SFG
  • well-bore cement

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nguyen, M. T., Wang, Z., Rod, K. A., Childers, M. I., Fernandez, C., Koech, P. K., ... Glezakou, V. A. (2018). Atomic Origins of the Self-Healing Function in Cement-Polymer Composites. ACS Applied Materials and Interfaces, 10(3), 3011-3019. https://doi.org/10.1021/acsami.7b13309