INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Characterization of Viscose Formulations through Rheological and Physicochemical Parameters
Autor/es:
LANIERI, DIANA B.; OLMOS, GRACIELA V.; MAXIMINO, MIRTHA G.; DEIBER, JULIO ALCIDES
Lugar:
Medellín
Reunión:
Congreso; VII CIADICYP, The VIII IberoAmerican Congress on Pulp and Paper Research; 2014
Institución organizadora:
UPB-RIADICYP
Resumen:
At present the manufacture of both cellulose derivatives and regenerated cellulose products has been enhanced due to many relevant applications that contemplate in part the biocompatibility of this natural polymer [1]. In this context the viscose process is still the predominant method for industrial cellulose dissolution [2]. It consists in treating the cellulose pulp with S2C to form cellulose xanthate, which is then dissolved in diluted NaOH to form the viscose. Molded products are obtained when the processed and well shaped viscose solution is chemically or thermally treated to yield regenerated high purity cellulose. Therefore the viscosity evaluation of this polymeric solution is relevant for its optimal and suitable processing. In this framework a methodology to evaluate the shear viscosity of viscose through the gravity-driven capillary viscometer [3,4] is presented. Two viscose samples were prepared from eucalyptus dissolving pulp treated with and without mechanical-enzymatic processing. This combined treatment on the pulp provides a decrease of the chain degree of polymerization DP and also an increase of reactivity of the resulting cellulose pulp [5]. The rheometric results are analyzed with simple rheological models, and characterization rheological parameters correlating with the DP of the cellulose chain are proposed. gravity-driven capillary viscometer [3,4] is presented. Two viscose samples were prepared from eucalyptus dissolving pulp treated with and without mechanical-enzymatic processing. This combined treatment on the pulp provides a decrease of the chain degree of polymerization DP and also an increase of reactivity of the resulting cellulose pulp [5]. The rheometric results are analyzed with simple rheological models, and characterization rheological parameters correlating with the DP of the cellulose chain are proposed. cellulose xanthate, which is then dissolved in diluted NaOH to form the viscose. Molded products are obtained when the processed and well shaped viscose solution is chemically or thermally treated to yield regenerated high purity cellulose. Therefore the viscosity evaluation of this polymeric solution is relevant for its optimal and suitable processing. In this framework a methodology to evaluate the shear viscosity of viscose through the gravity-driven capillary viscometer [3,4] is presented. Two viscose samples were prepared from eucalyptus dissolving pulp treated with and without mechanical-enzymatic processing. This combined treatment on the pulp provides a decrease of the chain degree of polymerization DP and also an increase of reactivity of the resulting cellulose pulp [5]. The rheometric results are analyzed with simple rheological models, and characterization rheological parameters correlating with the DP of the cellulose chain are proposed. gravity-driven capillary viscometer [3,4] is presented. Two viscose samples were prepared from eucalyptus dissolving pulp treated with and without mechanical-enzymatic processing. This combined treatment on the pulp provides a decrease of the chain degree of polymerization DP and also an increase of reactivity of the resulting cellulose pulp [5]. The rheometric results are analyzed with simple rheological models, and characterization rheological parameters correlating with the DP of the cellulose chain are proposed.