Rheological properties of concentrated solutions of galactomannans in an ionic liquid
スポンサーリンク
概要
- 論文の詳細を見る
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.
論文 | ランダム
- 9-12 中国地方の遊休地に成立した二次林内での放牧 : 1. 二次林内に形成された牛道の特徴
- 座談会 短篇小説の新しい波 (〈新潮クレスト・ブックス〉9周年記念)
- 対談 川上弘美×小池昌代/詩を書くひと、小説を書くひと
- ウオッチング2002 終末期リハビリテーションと地域医療が見つめるもの--大田仁史/齊藤正身
- 930 バイモルフ駆動機構用材料に関する研究