Influence of Heating and Freezing on the Hydrodynamic Properties of Ethyl Cellulose Dilute Solution

Abstract

Abstract: A closed viscometer was designed for viscosity measurement of volatile solvent-based solutions. The influence of freezing-thawing and heating on the hydrodynamic properties of EC molecules was studied by viscometry and size exclusion chromatographic (SEC) analysis. The change of molecular structure and conformation of EC molecules in solution after treatments is discussed. Freezing-thawing treatment reduces the viscosity of EC dilute solutions. However, it doesn't make any significant change of the SEC retention volume of EC sample in THFsolvent. This suggests that the apparent hydrodynamic volume of EC molecules slightly decrease. Heating treatment reduces the apparent hydrodynamic volume of EC molecules more evidently. The viscosity of EC solution decreases obviously after heating treatment.

Key words: Ethyl cellulose, Dilute solution, Freezing-thawing, Heating, Viscometry, Size exclusion chromatographic

CLC Number:

O631

TrendMD:

LI Li, YANG Hu, CHENG Rong-Shi, WANG Zhi-Liu . Influence of Heating and Freezing on the Hydrodynamic Properties of Ethyl Cellulose Dilute Solution[J]. Chem. J. Chinese Universities, 2002, 23(12): 2378.

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Influence of Heating and Freezing on the Hydrodynamic Properties of Ethyl Cellulose Dilute Solution

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