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1. Rheological properties of ionic liquid solutions of xanthan

Author

50201603, Horinaka, Jun-ichi, Tanaka, Maki, Takigawa, Toshikazu, 50201603, Horinaka, Jun-ichi, Tanaka, Maki, and Takigawa, Toshikazu

Abstract

Dynamic viscoelasticity and steady shear flow of ionic liquid solutions of xanthan were examined. Concentrated solutions of xanthan were prepared using 1-butyl-3-methylimidazolium acetate as the solvent. The solutions exhibited the viscoelastic behavior typical of polymer solutions with the entanglement coupling. The absolute value of the complex viscosity and the steady shear viscosity agreed quite well, namely the Cox-Merz rule held, when the terminal flow behavior was observed in the dynamic viscoelasticity and the zero-shear viscosity was able to be determined. The molecular weight between entanglements for xanthan in the molten state was estimated to be 1.7 × 10(4), being significantly greater than that for cellulose

Published
2015

2. Effects of side groups on the entanglement network of cellulosic polysaccharides

Author

50201603, Horinaka, Jun-ichi, Urabayashi, Yuhei, Takigawa, Toshikazu, 50201603, Horinaka, Jun-ichi, Urabayashi, Yuhei, and Takigawa, Toshikazu

Abstract

The transient entanglement networks of cellulosic polysaccharides in concentrated solutions were characterized by the molecular weight between entanglements (M e) using dynamic viscoelasticity measurements. From the concentration dependence ofM e, M e for the cellulosic polysaccharides in the molten state (M e, melt) was estimated as the material constant reflecting the chain characteristics. The values of M e, meltwere compared among three cellulosic polysaccharides: cellulose, methylcellulose, and hydroxypropyl cellulose. Methylcellulose and hydroxypropyl cellulose were employed as cellulose derivatives having small and large side groups, respectively. It appeared that hydroxypropyl cellulose had significantly larger M e, melt compared with cellulose and methyl cellulose. However, the numbers of repeating glucose-ring units between entanglements were very close to each other among the three polysaccharides.

Published
2015

4. Rheological properties of concentrated solutions of galactomannans in an ionic liquid

Author

00313734, 50201603, Horinaka, Jun-ichi, Yasuda, Ryosuke, Takigawa, Toshikazu, 00313734, 50201603, Horinaka, Jun-ichi, Yasuda, Ryosuke, and Takigawa, Toshikazu

Abstract

The rheological behavior of galactomannans in concentrated solutions was examined by using dynamic viscoelasticity measurements. Concentrated solutions of three galactomannans, guar gum, tara gum, and locust bean gum were prepared with an ionic liquid 1-butyl-3-methylimidazolium chloride as the solvent. Each galactomannan solution showed angular frequency dependence curves of the storage modulus and the loss modulus which were characteristic of a solution of entangled polymer chains. The molecular weight between entanglements (Me) was obtained from the plateau modulus and the concentration dependence of Me showed Me in the molten state (Me, melt) to be 4.6 × 10[3], 3.2 × 10[3], and 2.7 × 10[3] for guar gum, tara gum, and locust bean gum, respectively. It was found that the material constant Me, melt depends on the mannose/galactose ratio of the galactomannans. The number of monosaccharide units between entanglements in the molten state for the galactomannans varied within the range found for other polysaccharides such as cellulose and agarose in ionic liquids, suggesting that all the galactomannans take a random-coil conformation in ionic liquid solutions.

Published
2012

25. Loading effect on swelling of nematic elastomers

Author

20263147, 50201603, Urayama, Kenji, Mashita, Ryo, Kobayashi, Ichiro, Takigawa, Toshikazu, 20263147, 50201603, Urayama, Kenji, Mashita, Ryo, Kobayashi, Ichiro, and Takigawa, Toshikazu

Published
2007

43. Nonlinear rheology of multiarm star chains

Author

90167164, 00378853, 50201603, Watanabe, H, Matsumiya, Y, Ishida, S, Takigawa, T, Yamamoto, T, Vlassopoulos, D, Roovers, J, 90167164, 00378853, 50201603, Watanabe, H, Matsumiya, Y, Ishida, S, Takigawa, T, Yamamoto, T, Vlassopoulos, D, and Roovers, J

Published
2005

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