Abstract
This study is concerned with the adhesive properties of blends consisting of a copolymer phenolic resin and neoprene rubber. The phenolic resin is the condensation product of formaldehyde and a mixture of phenol and cardanol, a substituted phenol. Cardanol is the main ingredient of cashew nut shell liquid, a renewable resource and a cheap agro-by-product. The specific objective of the study is to arrive at optimum stoichiometric ratios between total phenol and formaldehyde (P/F ratio) so that the best peel and shear properties are obtained for aluminum-aluminum (Al–Al), styrene butadiene rubber-styrene butadiene rubber (SBR–SBR), and Al–SBR specimens. In general, the composition of the resin (represented by the P/F ratio) has only limited influence over the shear properties. Peel strength, on the other hand, is influenced by the P/F ratio. It is found to be a maximum for a P/F ratio of 1:1.5–1:1.7 for all cases. The results also prove that cardanol, a cheap renewable resource, can be a useful starting material for adhesive formulations.
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