Abstract
The dependence of loop tack, peel strength, and shear strength of NBR/SMR L blend-based pressure-sensitive adhesives on the rate of testing was investigated using coumarone-indene resin and toluene as the tackifier and solvent, respectively. A 40% NBR content in the NBR/SMR L blend was used throughout the experiment. The adhesion properties were measured by a Lloyd Adhesion Tester operating at different rates of testing. The result indicates that loop tack, peels strength, and shear strength increase with the rate of testing due to the viscoelastic response of the adhesive. At low testing rate, the failure mode is cohesive in nature whereas adhesion failure mode occurs at higher testing rates. Adhesion properties also increase with the increase in adhesive coating thickness, an observation which is attributed to the wettability of the adhesive and viscoelastic behavior of the rubber blend.
Highlights
Natural rubber has been commonly used to prepare pressuresensitive adhesives
For a fixed testing rate, tack value increases with coating thickness increase. This finding is ascribed to the larger amount of adhesive at higher coating thickness which enhances the viscoelastic response of the adhesive as shown in our results reported earlier [13,14,15] on natural rubber blendbased pressure sensitive adhesives
Loop tack of natural rubber and acrylonitrilebutadiene rubber (NBR)-/SMR L-based adhesive increases with the increase in the rate of testing, an observation which is attributed to the change in failure modes
Summary
Natural rubber has been commonly used to prepare pressuresensitive adhesives. In order to increase the adhesion property of the adhesive, it is necessary to add tackifying resins such as wood resin, terpene resin, and petroleum-based resins to the rubber adhesive [1]. Results show that adhesion properties strongly depend on the nature of rubber blend and its blend ratio All these polymer blend studies are concerned with the adhesion behavior of adhesives at one fixed testing rate. Since rubber adhesive is a viscoelastic material, testing rate is an important parameter in the adhesion behavior of the polymer blendbased adhesive. In view of this scarcity of the data, it is the aim of this paper to report our findings on the effect of testing rate on the tack, peel, and shear strength of acrylonitrile-butadiene rubber (NBR)/Standard Malaysian Rubber (SMR L) blend-based adhesive at various coating thicknesses
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