Effect of Composition on Adhesive Blends Consisting of Neoprene and Phenol-Cardanol-Formaldehyde Copolymer

摘要

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.