Rheological studies of gelatin formulations: influence of testing conditions on the results accuracy.

E.M. CIANNAMEA; L. A. CASTILLO; J. F. MARTUCCI; P.M. STEFANI; R. A. RUSECKAITE; BARBOSA S.

Congreso; XIV Simposio Latinoamericano de Polimeros Y XII Congreso Iberoamericano de Polímeros; 2014

Plasticized-gelatin formulations are natural polymers which gained high interest within academic and industrial area because allow obtaining biodegradable films and injected pieces. In this sense, the knowledge of flow properties is crucial in the processing design at industrial or pilot scale. Then, rheological measurements are important in order to adjust and model the processing operation. However, the main constrain found during the rheological behavior determination of plasticized gelatin formulations is the loss of water by evaporation. This may lead to significant errors or overestimation from rheological results which might have impact on processing parameters selection under actual conditions. In this work, a simple technique is proposed in order to avoid errors in rheological measurements by water evaporation in aqueous systems as formulations based on gelatin. The accuracy of the obtained results and assay conditions were studied. The repeatability of the rheological measurements with the proposed system validates the obtained results.