RHEOLOGICAL PROPERTIES OF CHITOSAN ACETATE BLENDS WITH VINYL POLYMERS
Journal Title: Progress on Chemistry and Application of Chitin and its Derivatives - Year 2009, Vol 0, Issue
Abstract
In the present paper the rheological properties of solutions of chitosan acetate (ChA), poly(vinyl alcohol) (PVA), polyacrylamide (PAM) and of ChA/PVA or ChA/PAM mixtures were studied. The measurements were carried out under the change of sample properties such as degree of hydrolysis PVA, molecular weight, and under variable experimental conditions such as temperature, shear rate, and blend composition. The criterion of miscibility of solution blends, based on the additivity rule of apparent shear viscosity has been discussed. Moreover, for the all investigated samples, the mathematical interpretation of relationship between the apparent viscosity ha and shear rate g, according to the Ostwald de Waele model was established. Activation energy of viscous flow (Ea) has also been determined and discussed. The obtained results suggested that the miscibility of ChA with PVA or PAM depends on the blend composition and on the molecular weight of ChA.
Authors and Affiliations
Katarzyna Lewandowska
Keywords
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