Dynamic Rheological Properties of Concentrated Chitosan Soltions
| Title: | Dynamic Rheological Properties of Concentrated Chitosan Soltions |
|---|---|
| Authors: | Martínez-Ruvalcaba A., Chornet E., Rodrigue D. |
| Source: | Applied Rheology, Vol 14, Iss 3, Pp 140-147 (2004) |
| Publisher Information: | De Gruyter, 2004. |
| Publication Year: | 2004 |
| Collection: | LCC:Materials of engineering and construction. Mechanics of materials |
| Subject Terms: | chitosan, cox-merz and laun rules, dynamic rheology, maxwell model, Materials of engineering and construction. Mechanics of materials, TA401-492 |
| More Details: | A detailed analysis of the dynamic flow properties of chitosan in solution at different temperatures (25 - 45°C), chitosan concentration (0.5% - 2.0%), solvent type (acetic, lactic, and hydrochloric acid), and ionic strength (0 and 0.2M NaCl) has been undertaken. The storage modulus, G’, loss modulus, G’’ and complex viscosity, η* have been determined over a wide range of frequencies and the results are presented using master curves. For the conditions studied, at low frequencies chitosan solutions show a constant complex viscosity which decreases as frequency increases. Likewise, storage modulus, G’ and loss modulus, G’’ increase as frequency increases with G’’ being always greater than G’ (η’ > η’’) indicating that viscous effects are more important than elastic effects. For modelling the oscillatory-shear results we used the generalized Maxwell model. Two empirical equations were used to correlate the data: Cox-Merz rule for viscosity and Laun's rule for primary normal stress difference. Both relations were found to represent our data for the experimental conditions studied. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1617-8106 66442451 |
| Relation: | https://doaj.org/toc/1617-8106 |
| DOI: | 10.1515/arh-2004-0009 |
| Access URL: | https://doaj.org/article/034a67a66442451cafa06f01a25a9ef2 |
| Accession Number: | edsdoj.034a67a66442451cafa06f01a25a9ef2 |
| Database: | Directory of Open Access Journals |
| ISSN: | 16178106 66442451 |
|---|---|
| DOI: | 10.1515/arh-2004-0009 |
| Published in: | Applied Rheology |
| Language: | English |