Journal article
Dynamic viscosity of maleate poly(vinyl alcohol) and its copolymer measured by rheometer
Polymer testing, v 56, pp 387-393
01 Dec 2016
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The objective of this work was to study the mechanism of gel formation for maleated poly(vinyl alcohol) (PVAM) and maleated poly(vinyl alcohol)-graft-gelatin (PVAM-g-GT) in solution form using a rheometer to monitor changes in the dynamic viscosity and shear stress-shear rate curves. The dynamic viscosity of the PVAM solution increased and then decreased with increases in the shear rate, and the dynamic viscosity of the PVAM solution decreased as a function of the MA content increased. The dynamic viscosity of the PVA solution was higher than that of the PVAM solution due to its gel formation. Moreover, the dynamic viscosity of the PVAM solution increased and then decreased over long periods. Over a storage time of 2 days, the dynamic viscosity of the PVAM decreased due to chain scission. The PVAM solution showed shear thickening in the first stage and shear thinning in the last stage of the experiment. The dynamic viscosity of the PVAM-g-GT solution continued to decrease continually at a constant rate with increases in the shear rate because the H-bonding was broken at higher shear rates. This was probably because the energy of the H-bonding interaction is less than the energy of carbon carbon covalent bonding resulting in broken H-bonding both intra-chain and inter-chain H-bond. (C) 2016 Elsevier Ltd. All rights reserved.
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Details
- Title
- Dynamic viscosity of maleate poly(vinyl alcohol) and its copolymer measured by rheometer
- Creators
- Wattana Sukhlaaied - Prince of Songkla UniversitySa-Ad Riyajan - Thammasat UniversityGiuseppe R. Palmese - Drexel University
- Publication Details
- Polymer testing, v 56, pp 387-393
- Publisher
- Elsevier
- Number of pages
- 7
- Grant note
- Royal Golden Jubilee Ph.D. Program; Thailand Research Fund (TRF) RSA5780018 / Thailand Research Fund/Prince of Songkla University/Thammasat University Drexel University
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000389090500049
- Scopus ID
- 2-s2.0-84994877317
- Other Identifier
- 991019168884904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Characterization & Testing
- Polymer Science