abstract
The effect of molecular weight and testing rate on peel and shear strength of epoxidized natural rubber (ENR-50)-based adhesive was investigated using petro resin as the tackifier. Toluene and polyethylene terephthalate were used as the solvent and substrate respectively. Peel and shear strength were determined by a Llyod Adhesion Tester operating at different rates of testing. Result shows that peel strength and shear strength increases up to an optimum molecular weight of 4.2 x 10(4) g/mol of ENR-50. This observation is attributed to the combined effects of wettability and mechanical strength of rubber for peel strength. For shear strength, it is ascribed to the optimum cohesive and adhesive strength. Both peel strength and shear strength increases with increasing rate of testing, an observation which is associated to the viscoeslastic response of the adhesive. Thermal study, SEM and FTIR study confirms the miscibility of tackifier with ENR-50.
keywords
PRESSURE-SENSITIVE ADHESIVES; COUMARONE-INDENE RESIN; PEEL ADHESION; GUM ROSIN; BLENDS; TACK; MISCIBILITY; VISCOSITY; STRENGTH; POLY(STYRENE-CO-ACRYLONITRILE)
subject category
Engineering; Polymer Science
authors
Khan, I; Poh, BT
our authors
Imran Khan
Post-Doc FellowshipGroups
acknowledgements
The authors acknowledge the research grant (FRGS) and post doctoral funding provided by Universiti Sains Malaysia that has resulted in this article.