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Effect of Solution Concentration on the Gelation of Aqueous Polyvinyl Alcohol Solution by Mingzhu Liu; Rongshi Cheng; Renyuan Qian is a Materials Science article available to read on EtoBox.

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## Abstract The concentration dependence of cryogenic gelation for aqueous solution of poly(vinyl alcohol) was studied by measuring the apparent gel fraction __G__ and the swelling ratio __Q__ of the gel formed by freezing and thawing. It was found that for the gelation process there were three distinct regions of solution concentration bounded by two concentrations __C__~gel~ and __C__. The gel started to form at __C__ = __C__~gel~, while no visible gel could be detected even upon repeated freezing and thawing of the extremely dilute solutions of __C__ __C__. In the intermediate concentration region, __C__~gel~ < __C__ < __C__, which covers three orders of magnitude in concentration, gel and sol phases coexist. Both concentration dependencies of __G__ and __Q__ show two branches jointed at a concentration very close to the overlap concentration C^\*^. The curve of __G__ċ__Q__ versus __C__ shows a sharp cusp. In case the sharp cusp concentration is really the value of __C__^\*^, gelation offers a precise method to determine the overlap concentration. ©1995 John Wiley & Sons, Inc.

Who reads Effect of Solution Concentration on the Gelation of Aqueous Polyvinyl Alcohol Solution?

Author

Mingzhu Liu; Rongshi Cheng; Renyuan Qian

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

1995

Language

EN

Field

Materials Science (Physical Sciences)