Properties of chitosan and microcrystalline cellulose composite gels

• Autorzy: Laka M. , Chernyavska S. , Jakobsons E.
• Konferencja: Third International Conference on Engineering Rheology, ICER 2005
• Języki publikacji: EN

Abstrakty

EN

The rheological properties of chitosan and microcrystalline cellulose (MCC) composite gels, as well as the mechanical properties, water vapour sorption and swelling of films prepared from them were investigated. It has been shown that, on addition of liquid crystalline 9% MCC gels to non-liquid crystalline 2% chitosan gels, composite gels at sufficiently great MCC contents acquire liquid crystalline rheological properties. The dependence of the viscosity of composite gels on the MCC content has an extreme character with a minimum. When the MCC content reaches the value at which a liquid crystalline structure is formed in the composite gel, viscosity decreases somewhat. A study of the properties of the films has shown that, with increasing MCC content up to 65%, the tensile stress and modulus of elasticity of the film samples increase, while elongation at break, water vapour sorption and swelling decrease. This can be explained mainly by the formation of bonds between the MCC carbonyl and carboxyl groups and chitosan amino groups.

Słowa kluczowe

EN

chitosan; microcrystalline cellulose; composite gels; viscosity; tensile stress; modulus of elasticity; relative elongation at break

PL

kompozyty; celuloza mikrokrystaliczna; lepkość; moduł sprężystości

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2005
• Tom: Vol. 10, no spec
• Strony: 323--327
• Opis fizyczny: Bibliogr. 8 poz., wykr.

Twórcy

autor

Laka M.

• Latvian State Institute of Wood Chemistry 27 Dzerbenes Street, LV-1006 Riga, LATVIA

autor

Chernyavska S.

• Latvian State Institute of Wood Chemistry 27 Dzerbenes Street, LV-1006 Riga, LATVIA

autor

Jakobsons E.

• Institute of Polymer Mechanics, Latvian University 23 Aizkraules Street, LV-1006 Riga,LATVIA

Bibliografia

• [1] Guido S. and Grizzutti N. (1995): Phase separation effects in the rheology of aqueous Solutions - Rheologica Acta, vol.34, No.2, pp.137-146.
• [2] Hosokawa J. et al. (1990): Biodegradable film derived from chitosan and homogenized cellulose. - Ind. Eng. Chem. Res., vol.29, No.5, pp.800-805.
• [3] Karyakina M. (1977): Laboratory Practical Works on Testing Paintwork Materials and Coats (in Russian). - Moscow: Khimiya.
• [4] Laka M. and Chemyavskaya S. (1996): Method for obtaining microcrystalline cellulose. Patent of Latvia No. 11184. - Patenti un Preću Zimes, vol.4, p.878.
• [5] Laka M. et al. (2000): Preparation and properties of microcrystalline cellulose gels. - Cellulose Chemistry and Technology, vol.34, No.3-4, pp.217-227.
• [6] Laka M. et al. (2003): Composites based on microcrystalline cellulose gels and other substances. - Cellulose Chemistry and Technology, vol.37, No. 1-2, pp.69-77.
• [7] Muzzarelli R.A.A. and Peter M.G. (1997): Chitin Handbook. - European Chitin Society.
• [8] TAPPI (2000-2001): Test Methods.T491om-99.