Page 87 - Handbook of Surface Improvement and Modification

82 Tackifiers

this behavior was attributed to the combined effects of wettability and mechanical strength
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of rubber at the optimum molecular weight. In the case of shear strength, the behavior
was attributed to the maximum cohesive and adhesive strength during the shearing
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action. Peel and shear strength also increased with increase in rate of testing, an observa-
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tion which was associated with the viscoelastic response of the adhesive. At low rates,
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the response was predominantly viscous and cohesive failure occurred. At higher rates,
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the response became predominantly elastic which resulted in adhesive failure.