Abstract
Wood adhesives with enhanced properties were prepared by incorporating either citric or boric acid. The citric acid and boric acid were added in the presence of water being the polymers and acids readily soluble in water. The reaction was carried out at a relatively lower temperature in order to prevent water evaporation and damage to the starch structure. Two series of adhesives were prepared with varying starch and polyvinyl acetate content. The adhesives were characterized by Fourier-transform infrared spectroscopy and dynamic mechanical analysis. The effects of citric and boric acid on performance properties like wet tack, tensile shear strength, rheology and viscosity stability were studied. The results showed that by addition of acids there is an increase in mechanical strength, viscosity and wet tack in the case of boric acid. Similarly, better viscosity stability was observed due to addition of citric acid. From the tests conducted, it can be concluded that the composition for optimum level performance and stability is at 0.3 wt% of citric acid and 0.1 wt% of boric acid of the total composition of adhesive.
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