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A Novel Liquid-Crystalline Phase in Dilute Aqueous Solutions of Methylcellulose

✍ Scribed by Yimei Yin; Katsuyoshi Nishinari; Hongbin Zhang; Takahiro Funami

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
190 KB
Volume
27
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: The existence of liquid‐crystalline (LC) phases in dilute methylcellulose solutions is demonstrated by exothermic peaks in differential scanning calorimetry (DSC) curves upon heating and is evidenced by a discontinuity of the dynamic storage modulus when the concentration of methylcellulose increases. This crystalline phenomenon is further confirmed by polarized light microscopy and optical rotatory dispersion measurements. It is found that the appearance of the LC formation is related to the temperature, concentration, and molecular weight of methylcellulose.

The exothermic peaks in DSC curves upon heating and cooling, and conformational transitions in ORD profiles for 2.5 g · L^−1^ SM4000 methylcellulose aqueous solutions.

magnified imageThe exothermic peaks in DSC curves upon heating and cooling, and conformational transitions in ORD profiles for 2.5 g · L^−1^ SM4000 methylcellulose aqueous solutions.

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