Rheological peculiarities of microcrystalline cellulose gels

• Autorzy: Laka M. , Chernyavska S. , Faitelson L. , Jakobsons E.
• Konferencja: Proceedings of the International Conference on Engineering Rheology ICER '99
• Języki publikacji: EN

Abstrakty

EN

Rheological properties of MCC hydro- and alcogels have been studied. MCC gels were obtained by way of dispersing in water, ethyl alcohol and propyl alcohol media the wood pulp destructed to the levelling-off degree of polymerization (LODP) of cellulose by a method developed by us. At a sufficiently high cellulose concentration which was dependent on the liquid medium, MCC gels with rheological properties typical for liquid crystalline polymers (flow curves with three characteristic regions, viscosity concentrations curves with a local maximum, etc.) were obtained. These properties are more pronounced for hydrogels. MCC hydrogels are characterized also by a higher liquid phase retention volume (~ 380%), which is an important characteristic of a stable gel. For MCC alcogels, it makes up 40-65%. Inferior properties of MCC alcogels are connected with the chemical structure of alcohol molecules which, as compared to water molecules, are less favourable for bonds formation among cellulose microcrystallites and the liquid medium.

Słowa kluczowe

EN

microcrystalline cellulose gels; shear stress; yield stress; shear rate

PL

reologia

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1999
• Tom: Vol. 4, no spec.
• Strony: 351--355
• Opis fizyczny: Bibliogr. 7 poz., wykr.

Twórcy

autor

Laka M.

autor

Chernyavska S.

autor

Faitelson L.

autor

Jakobsons E.

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