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Buchumschlag von Calculation of alcohol‐acetone‐cellulose acetate ternary phase diagram and their relevance to membrane formation
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Calculation of alcohol‐acetone‐cellulose acetate ternary phase diagram and their relevance to membrane formation

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Zeitschriftentitel: Journal of Applied Polymer Science
Personen und Körperschaften: Hao, Ji Hua, Wang, Shichang
In: Journal of Applied Polymer Science, 80, 2001, 10, S. 1650-1657
Medientyp: E-Article
Sprache: Englisch
veröffentlicht:
Wiley
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Zusammenfassung: <jats:title>Abstract</jats:title><jats:p>ABSTRACT</jats:p><jats:p>Alcohol‐acetone‐cellulose acetate phase diagrams incorporated with methanol, ethanol, and isopropanol as nonsolvents are calculated according to a new form of the Flory–Huggins equation. Nonsolvent–cellulose acetate interaction parameters are measured by swelling experiments. Concentration‐dependent nonsolvent–solvent interaction parameters are obtained by vapor–liquid equilibrium and the Wilson equation. It is shown that alcohol is a week coagulant compared with water, and water &gt; methanol &gt; ethanol &gt; isopropanol for cellulose acetate. The phase diagrams characteristic of acetone‐cellulose acetate combined with water, methanol, ethanol, and isopropanol as nonsolvents is different, which leads to the different morphological structure of a cellulose acetate membrane. The structure of a water coagulated membrane has large macrovoids from liquid–liquid phase separation. A methanol coagulated membrane has a honeycomb‐like structure from spinodal microphase separation. An ethanol or isopropanol coagulated membrane has a thicker, dense top layer from the delay time phase separation. © 2001 John Wiley &amp; Sons, Inc. J Appl Polym Sci 80: 1650–1657, 2001</jats:p>
Umfang: 1650-1657
ISSN: 0021-8995
1097-4628
DOI: 10.1002/app.1259