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Rosamaria Marino, Samuele Giovando, Domenico Gabriele
Effect of tannin addition on the rheological properties of starch-based adhesives
Appl. Rheol. 24:4 (2014) 46138 (10 pages)
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Starch-based adhesives play a relevant role in paperboard production and are becoming more and more interesting, for different
uses, because they are based on renewable biopolymers. Starch modifications or additive addition are becoming frequent
to obtain the macroscopic properties desired for specific uses. In this paper the effects of the addition of four different
tannins on a typical adhesive, adopted for corrugated paperboard production, were investigated by using fundamental rheological
techniques, both in dynamic and steady conditions. It was found that tannins increase the onset of starch gelatinisation,
estimated as the knee point of the storage modulus in a dynamic temperature ramp test, and decrease the steady
shear viscosity. This is due to the interactions between tannin and starch that affect the gelatinisation and retrogradation
reactions weakening the starch network. Even though a partial reinforcement effect was also observed, owing to the polymeric
nature of tannin components, a lower consistency, with respect to the neat adhesive, was found for all modified samples.
Tannin has shown itself able to modify technological properties such as gelatinization temperature and viscosity, since
the specific results are determined by the nature and amount of tannin; therefore it could be used to adapt adhesive characteristics
to specific applications, potentially improving starch-based adhesive competitiveness with respect to different adhesives.
► Cite this publication as follows:
Marino R, Giovando S, Gabriele D: Effect of tannin addition on the rheological properties of starch-based adhesives, Appl. Rheol. 24 (2014) 46138.
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