Abstract
An axisymmetric adhesion apparatus was used to characterize the adhesive and viscoelastic properties of acrylic block copolymer layers that behave as model pressure sensitive adhesives. The mechanisms of deformation were summarized and related to the structure and linear viscoelastic response of each model adhesive. In cases where the area between the adhesive layer and adhering surface remained circular and shrunk uniformly during detachment, the adhesive failure criterion can be quantified and compared to predictions from linear elastic fracture mechanics. The nature of adhesive failure can not be reconciled with these traditional, low-strain approaches, but is consistent with models of large strain elasticity, provided that the finite thickness of the adhesive layer is taken into account. A dimensionless ratio involving the adhesive strength, elastic modulus and adhesive layer thickness can be used to define the regime in which the adhesive failure criterion can be quantified with linear elastic fracture mechanics.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 397-415 |
| Number of pages | 19 |
| Journal | Journal of Adhesion |
| Volume | 81 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Mar 2005 |
Funding
This work was supported by the National Science Foundation, through the MRSEC program at the Materials Research Center of Northwestern University (DME-0076097) and through an individual investigator grant (DMR-0214146). We would also like to express our appreciation to Manoj Chaudhury. The creativity and depth of his work in adhesion science has inspired much of our own work in this area.
Keywords
- Acrylic block copolymers
- Adhesive failure criterion
- Axisymmetric adhesion test
- Large strain elasticity
- Pressure sensitive adhesives
- Probe tack test
ASJC Scopus subject areas
- General Chemistry
- Mechanics of Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
