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Title: Rheological properties of concentrated solutions of a branched polysaccharide dextran in an ionic liquid
Authors: Horinaka, Jun Ichi
Yamanaka, Ayumi
Takigawa, Toshikazu
Author's alias: 堀中, 順一
瀧川, 敏算
Keywords: Dextran
Branched structure
Concentrated solution
Issue Date: 13-Sep-2019
Publisher: Society of Rheology
Journal title: Nihon Reoroji Gakkaishi
Volume: 47
Issue: 4
Start page: 155
End page: 159
Abstract: Rheological properties of dextran solutions in 1-butyl-3-methylimidazolium acetate were examined up to the concentration (c) of 4.1 × 10² kgm⁻³. A high molecular weight (≈ 2 × 10⁶) dextran with a degree of divergence of 4 % was used. The zero-shear viscosity estimated from the flow behavior indicated that dextran chains in the solutions entangle each other at c ≥ 1.7 × 10² kgm⁻³. In fact the plateau modulus (GN⁰) was obtained from the G′ and G″ curves for c ≥ 2.6 × 10² kgm⁻³. However, the anomalous results were obtained regarding entanglement of dextran chains: The molecular weight between entanglements was constant against c at 2.3 × 10⁴, so that a large number of entanglements per chain was expected in spite of the subtle rubbery plateau that was actually observed. It was proposed that the dextran has the main structure of long branches and each branch is densely sub-branched.
Rights: © 2019 The Society of Rheology, Japan
DOI(Published Version): 10.1678/rheology.47.155
Appears in Collections:Journal Articles

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