Mechanisms of criticality in environmental adhesion loss

Christopher White, Kar Tean Tan, Donald Hunston, Kristen Steffens, Deborah L. Stanley, Sushil K. Satija, Bulent Akgun, Bryan D. Vogt

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Moisture attack on adhesive joints is a long-standing scientific and engineering problem. A particularly interesting observation is that when the moisture level in certain systems exceeds a critical concentration, the bonded joint shows a dramatic loss of strength. The joint interface plays a dominant role in this phenomenon; however, why a critical concentration of moisture exists and what role is played by the properties of the bulk adhesive have not been adequately addressed. Moreover if the interface is crucial, the local water content near the interface will help elucidate the mechanisms of criticality more than the more commonly examined bulk water concentration in the adhesive. To gain a detailed picture of this criticality, we have combined a fracture mechanics approach to determine joint strength with neutron reflectivity, which provides the moisture distribution near the interface. A well-defined model system, silica glass substrates bonded to a series of polymers based on poly(n-alkyl methacrylate), was utilized to probe the role of the adhesive in a systematic manner. By altering the alkyl chain length, the molecular structure of the polymer can be systematically changed to vary the chemical and physical properties of the adhesive over a relatively wide range. Our findings suggest that the loss of adhesion is dependent on a combination of the build-up of the local water concentration near the interface, interfacial swelling stresses resulting from water absorption, and water-induced weakening of the interfacial bonds. This complexity explains the source of criticality in environmental adhesion failure and could enable design of adhesives to minimize environmental failure. This journal is

Original languageEnglish (US)
Pages (from-to)3994-4001
Number of pages8
JournalSoft Matter
Volume11
Issue number20
DOIs
StatePublished - May 28 2015

Fingerprint

adhesives
Adhesives
adhesion
Adhesion
moisture
Moisture
Water
Polymers
water
Adhesive joints
Methacrylates
bonded joints
Water absorption
Fused silica
Chain length
fracture mechanics
Fracture mechanics
Chemical properties
Water content
Molecular structure

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

White, C., Tan, K. T., Hunston, D., Steffens, K., Stanley, D. L., Satija, S. K., ... Vogt, B. D. (2015). Mechanisms of criticality in environmental adhesion loss. Soft Matter, 11(20), 3994-4001. https://doi.org/10.1039/c4sm02725f
White, Christopher ; Tan, Kar Tean ; Hunston, Donald ; Steffens, Kristen ; Stanley, Deborah L. ; Satija, Sushil K. ; Akgun, Bulent ; Vogt, Bryan D. / Mechanisms of criticality in environmental adhesion loss. In: Soft Matter. 2015 ; Vol. 11, No. 20. pp. 3994-4001.
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White, C, Tan, KT, Hunston, D, Steffens, K, Stanley, DL, Satija, SK, Akgun, B & Vogt, BD 2015, 'Mechanisms of criticality in environmental adhesion loss', Soft Matter, vol. 11, no. 20, pp. 3994-4001. https://doi.org/10.1039/c4sm02725f

Mechanisms of criticality in environmental adhesion loss. / White, Christopher; Tan, Kar Tean; Hunston, Donald; Steffens, Kristen; Stanley, Deborah L.; Satija, Sushil K.; Akgun, Bulent; Vogt, Bryan D.

In: Soft Matter, Vol. 11, No. 20, 28.05.2015, p. 3994-4001.

Research output: Contribution to journalArticle

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AU - White, Christopher

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AU - Hunston, Donald

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White C, Tan KT, Hunston D, Steffens K, Stanley DL, Satija SK et al. Mechanisms of criticality in environmental adhesion loss. Soft Matter. 2015 May 28;11(20):3994-4001. https://doi.org/10.1039/c4sm02725f