Thermodynamic analysis of polymer-solid adhesion: Sticker and receptor group effects

Ilsoon Lee, Richard P. Wool

Research output: Contribution to journalArticle

  • 17 Citations

Abstract

Adhesion of dense linear polymer chains containing a small number of randomly distributed sticker groups (φX) to a solid substrate containing receptor groups (φY) has been analyzed by a single-chain scaling approach. An entanglement sink probability (ESP) model motivated by vector percolation explains the nonmonotonic influences of sticker concentration (φX), receptor concentration (φY), and their interaction strength (χ) on the adhesion strength GIC of the polymer-solid interface. The ESP model quantifies the degree of interdigitation between adsorbed and neighboring chains on the basis of the adsorbed chain domain with an extension of the scaling treatment of de Gennes. Here, the adsorbed chain domain changes thermodynamically with respect to the energy of interaction parameter, r = χφXφY. This model considers the situation of a blend consisting of a small volume fraction of adhesive molecules as a compatibilizer at the interface, where these molecules promote adhesion by adsorbing to the surface via sticker-receptor interactions. The percolation model scales solely with r = χφXφY, and this parameter can be related to both the adhesive potential (GA) and the cohesive potential (GC). GA describes adhesive failure between adsorbed chains and the solid surface and linearly behaves as GA ∼ r = χφXφY. The cohesive strength between adsorbed and neighboring chains corresponds to GC ∼ r-0.5∼-1.0 = (χφXφY)-0.5∼-1.0. When the fracture stresses for cohesive and adhesive failure are equal, the model predicts maximum adhesion strength at an optimal value of r* = (χφXφY)*. Thus, for a given χ value, optimal values φX* and φY* exist for the sticker and receptor groups, above or below which the fracture energy will not be optimized. Alternatively, if the X-Y interaction strength χ increases, then the number of sticker groups required to achieve the optimum strength decreases. Significantly, the optimum strength is not obtained when the surface is completely covered with receptor groups (φY = 1) but is closer to 30%. For polybutadiene, the optimum value of r* was determined experimentally (Lee, I.; Wool, R. P. J Adhesion 2001, 75, 299), and typically φX* ≈ 1-3%, φY* ≈ 25-30%.

Original languageEnglish (US)
Pages (from-to)2343-2353
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume40
Issue number20
DOIs
StatePublished - Oct 15 2002
Externally publishedYes

Profile

Anthralin
adhesion
Butylene Glycols
Adhesives
Adhesion
Edema Disease of Swine
Aldicarb
Polymers
adhesives
interactions
polymers
Bond strength (materials)
Calculi
Molecules
sinks
scaling
molecules
energy
Dihydropteroate Synthase
Iduronidase

Keywords

  • Adhesion
  • Fracture
  • Functionalization of polymers
  • Polybutadiene
  • Strength
  • Structure-property relations
  • Theory
  • Thermodynamics
  • Thin films

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Thermodynamic analysis of polymer-solid adhesion : Sticker and receptor group effects. / Lee, Ilsoon; Wool, Richard P.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 40, No. 20, 15.10.2002, p. 2343-2353.

Research output: Contribution to journalArticle

Lee, Ilsoon; Wool, Richard P. / Thermodynamic analysis of polymer-solid adhesion : Sticker and receptor group effects.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 40, No. 20, 15.10.2002, p. 2343-2353.

Research output: Contribution to journalArticle

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