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Title Interfacial Bonding Energies of Pressure Sensitive Adhesives to Substrates
Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages 393-399
Subject Mechanical Engineering
Date of Publication June 2021

AUTHOR(S) Okpe Bernard Okechukwu,Chukwuneke Jeremiah Lekwuwa and Omenyi Sam Nna

ABSTRACT

The study reports the interfacial bonding energies of pressure-sensitive adhesives (PSAs). The materials include Acrylic, PVC-abro, Polyurethane and Epoxy as single PSAs and Hybrid PSAs from the single PSAs. The substrate material was a mild steel plate of 130mm x 130mm with 12mm thickness. The force/tack required to debond the PSA from the substrate was measured with a universal testing machine. For determination of interfacial bonding energies between the PSA and the substrate, the contact angle technique was used. This allowed for interfacial free energies calculation, hence the adhesive energies. The maximum forces (tack) at maximum machine deflection, was calculated also. Epoxy PSA appears to have the greatest tack with tack strength of 3.358E-05 N/m). This gave a stronger force required to debond or pull it out from the substrate. Acrylic PSA gives lowest tack strength of 0.854E-5N/m, hence not the best for tough adhesive determination. Hybrid PSAs gave higher tack than the single PSAs which is preferable for heavy-duty adhesive work. For both single and hybrid PSAs, an increase in work of adhesion was found to lead to an increase in the bonding strength or tack strength of the adhesive. Hybridization was found to increase the bonding strength of the resulting adhesive, on the average by about 19%. Thus valuable to those in carpentry, leather works or composites.


Keywords: Adhesion, cohesion, tack, hybrid, stress-deflection




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