Abstract
Viscosity and adhesion properties of NBR/SMR L blend based pressure-sensitive adhesive were investigated using coumarone-indene resin, toluene, and poly(ethylene terephthalate) (PET) as tackifier, solvent, and coating substrate, respectively. Coumarone-indene resin content was fixed at 40 parts per hundred parts of rubber (phr) in the adhesive formulation. The ratio of NBR/SMR L blend used was 0, 20, 40, 60, 80, and 100% of NBR content. Four different thicknesses, that is, 30, 60, 90, and 120 µm, were used to coat the PET film. The viscosity of adhesive was determined by a Brookfield viscometer, whereas loop tack, peel strength, and shear strength were measured using a Lloyd Adhesion Tester operating at 30 cm/min. Result indicates that the viscosity, loop tack, and shear strength of blend adhesives increase with % NBR. However, for peel strength, it indicates a maximum at 40% NBR blend ratio for the three modes of peel tests. In all cases, 120 µm coated sample consistently exhibits the highest adhesion values compared to the other coating thicknesses, an observation which is associated with the higher volume of adhesive in the former system.
Highlights
Many studies on rubber-based adhesives involve a single component rubber as the elastomer in the adhesive formulation
Result shows that the viscosity of NBR-based adhesive is 30.5% higher than that of SMR Lbased adhesive. This means that NBR content has significant effect in the NBR/SMR L blend adhesive for higher NBR
Loop tack increases with increase in NBR content
Summary
Many studies on rubber-based adhesives involve a single component rubber as the elastomer in the adhesive formulation. Thitithammawong et al [6] discussed the preparation and properties of chlorinated epoxidized natural rubber latex and its latexbased adhesives. Study on the adhesive properties of rubberbased blends is rarely reported. Phillips et al [8, 9] have studied the singlet oxygen generation and adhesive properties in polymer blends adhesives using block copolymers as the elastomers. [11] reported the pressure-sensitive adhesive applications of compatible blend of styrene-vinyl acetate copolymer/natural rubber latex. Reported that blending of deproteinized natural rubber with several polymers improves the adhesive properties. Riyajan et al [15, 16] studied the adhesion property of skim rubber/poly(vinyl alcohol) biodegradable pressure-sensitive adhesive. In view of the scarcity of research conducted on the adhesion behaviour of
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