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Determining the influence of N-acetylation on water sorption in chitosan films
- Source :
- RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia, instname
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Water absorption in chitosan rapidly increases when the deacetylation degree decreases between 85 and 45%. This seems to contradict the fact that water absorption in chitin is much lower than that of chitosan. The aim of this paper is to understand this feature by measuring the main parameters affecting equilibrium water content. Since swelling capacity depends on the water–polymer interaction, the Flory Huggins interaction parameter was evaluated, finding small or null dependence on the deacetylation degree. Other factor influencing elastic energy is chain stiffness related to the elastic modulus that was measured as a function of deacetylation degree. Besides, crystalline structure was measured by X-ray diffraction patterns as a characteristic of cross-linking density. These observations led us to conclude that the instability of crystals during the swelling process increases with decreasing deacetylation degree, explaining the high equilibrium water content of low deacetylation chitosans.<br />The authors gratefully acknowledge the financial support from the Spanish Ministry of Economy and Competitiveness through the MAT2013-46467-C4-1-R project, including FEDER funds. CIBER-BBN is an initiative funded by the VI National R&D&I Plan 2008-2011, Iniciativa Ingenio 2010, Consolider Program, CIBER Actions and financed by the Instituto de Salud Carlos III with the assistance of the European Regional Development Fund.
- Subjects :
- Absorption of water
Polymers and Plastics
Nitrogen
Thermodynamics
Flory–Huggins solution theory
Chitosan
chemistry.chemical_compound
Crystallinity
Polymer chemistry
Materials Chemistry
medicine
Elastic modulus
Mechanical Phenomena
Deacetylation degree
Organic Chemistry
Swelling capacity
Elastic energy
Water
Chain stiffness
Acetylation
Flory Huggins parameter
Absorption, Physicochemical
chemistry
FISICA APLICADA
MAQUINAS Y MOTORES TERMICOS
Water absorption
Volatilization
Swelling
medicine.symptom
TERMODINAMICA APLICADA (UPV)
Subjects
Details
- ISSN :
- 01448617
- Volume :
- 133
- Database :
- OpenAIRE
- Journal :
- Carbohydrate Polymers
- Accession number :
- edsair.doi.dedup.....61f1baf8fb0f5777b14db614dbc022a4