Premium
Rheological and Morphological Properties of Carboxymethylcellulose/Starch Blends with or without ZnO and Their Applications as Inoculant Carrier
Author(s) -
da Silva Coutinho Marcio,
da Silva Danielle Cristina Fernandes,
Xavier Gustavo Ribeiro,
Rumjanek Norma Gouvêa,
de Oliveira Paulo Jansen
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100143
Subject(s) - starch , materials science , rheology , viscoelasticity , arrhenius equation , shear rate , composite material , zinc , viscosity , elasticity (physics) , activation energy , chemistry , organic chemistry , metallurgy
Summary: Using controlled shear‐rate testing ramps, this study investigates the rheological properties of carboxymethycellulose (CMC)/starch blends, with and without zinc oxide (ZnO). Viscosity decreased as the amount of starch increased and after adding 1% ZnO. The creep and recovery tests indicated that, with increasing starch content, there was a decrease in elasticity and the viscosity zero shear rate. The results also showed, in the temperature range between 25 and 70 °C, an inversion occurred in the elastic and viscous moduli behavior, obeying the Arrhenius equation. The addition of ZnO affects the viscoelastic behavior and the morphology of the blends. The best survival results were obtained for samples 50/50 and 60/40 wt% (CMC/starch).