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Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends

In this study, a number of ternary mixture aqueous solutions of chitosan/agar/poly vinyl alcohol (CS/AG/PVA) at different proportions (considering chitosan as the main component) were prepared. The effects of temperature, shear rate, shearing time and storage time on the rheological properties, i.e....

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Main Authors: El-hefian, Esam A., Nasef, Mohamed Mahmoud, Yahaya, Abdul Hamid
Format: Article
Published: International Network for Scientific Information Publication (INSI) 2010
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/26578/
http://www.aensionline.com/jasr/jasr/2010/460-468.pdf.
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spelling my.utm.265782018-10-31T12:30:34Z http://eprints.utm.my/id/eprint/26578/ Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends El-hefian, Esam A. Nasef, Mohamed Mahmoud Yahaya, Abdul Hamid TP Chemical technology In this study, a number of ternary mixture aqueous solutions of chitosan/agar/poly vinyl alcohol (CS/AG/PVA) at different proportions (considering chitosan as the main component) were prepared. The effects of temperature, shear rate, shearing time and storage time on the rheological properties, i.e., the apparent viscosity and the shear stress as a function of shear rate were investigated for the ternary system. Results showed that a Newtonian behavior was observed at temperatures from 40 o C to 55 o C for the ratios 90/05/05 and 80/10/10. The mixture solutions become pseudoplastic (shear thinning) when the concentrations of agar and PVA were higher than 10 % each. It was also found that all the blend solutions obeyed the Arrhenius equation. In addition, the effect of the shearing time on the shearing viscosity did not show any significant change at all shearing times applied for lower concentrations than 15% of each of agar and PVA in this study. However, at higher concentrations of agar and PVA, a rheopectic behavior was observed. Furthermore, different behaviors were observed for the blend solutions when the period of storage was extended to three weeks. The observations obtained from the rheological measurement suggested the existence of interaction between the three polymers. Finally, the morphology of the blended films confirmed the interaction between the functional groups of the blend components. International Network for Scientific Information Publication (INSI) 2010 Article PeerReviewed El-hefian, Esam A. and Nasef, Mohamed Mahmoud and Yahaya, Abdul Hamid (2010) Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends. Journal of Applied Sciences Research, 6 (5). 460 -468. ISSN 1816-157X http://www.aensionline.com/jasr/jasr/2010/460-468.pdf.
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
El-hefian, Esam A.
Nasef, Mohamed Mahmoud
Yahaya, Abdul Hamid
Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
description In this study, a number of ternary mixture aqueous solutions of chitosan/agar/poly vinyl alcohol (CS/AG/PVA) at different proportions (considering chitosan as the main component) were prepared. The effects of temperature, shear rate, shearing time and storage time on the rheological properties, i.e., the apparent viscosity and the shear stress as a function of shear rate were investigated for the ternary system. Results showed that a Newtonian behavior was observed at temperatures from 40 o C to 55 o C for the ratios 90/05/05 and 80/10/10. The mixture solutions become pseudoplastic (shear thinning) when the concentrations of agar and PVA were higher than 10 % each. It was also found that all the blend solutions obeyed the Arrhenius equation. In addition, the effect of the shearing time on the shearing viscosity did not show any significant change at all shearing times applied for lower concentrations than 15% of each of agar and PVA in this study. However, at higher concentrations of agar and PVA, a rheopectic behavior was observed. Furthermore, different behaviors were observed for the blend solutions when the period of storage was extended to three weeks. The observations obtained from the rheological measurement suggested the existence of interaction between the three polymers. Finally, the morphology of the blended films confirmed the interaction between the functional groups of the blend components.
format Article
author El-hefian, Esam A.
Nasef, Mohamed Mahmoud
Yahaya, Abdul Hamid
author_facet El-hefian, Esam A.
Nasef, Mohamed Mahmoud
Yahaya, Abdul Hamid
author_sort El-hefian, Esam A.
title Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
title_short Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
title_full Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
title_fullStr Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
title_full_unstemmed Rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
title_sort rheological and morphological studies of chitosan/agar/ poly (vinyl alcohol) blends
publisher International Network for Scientific Information Publication (INSI)
publishDate 2010
url http://eprints.utm.my/id/eprint/26578/
http://www.aensionline.com/jasr/jasr/2010/460-468.pdf.
_version_ 1643647800029741056
score 13.211869

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