The interaction of water with polyurethanes containing block copolymer soft segments

Autor:	N. S. Schneider, Joyce L. Illinger, Frank E. Karasz
Rok vydání:	1993
Předmět:	Polypropylene Absorption of water Polymers and Plastics Chemistry Oxide General Chemistry Surfaces Coatings and Films chemistry.chemical_compound Chemical engineering Polymer chemistry Materials Chemistry Copolymer Bound water Solubility Water content Polyurethane
Zdroj:	Journal of Applied Polymer Science. 47:1419-1425
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1993.070470813
Popis:	The saturation water uptake and nonfreezing water, determined as a function of temperature in a polyurethane containing the pure polyethylene oxide soft segment (I) and in polyurethanes containing block copolymer polyethylene oxide/polypropylene oxide soft segments (II), show significantly different behavior. In sample I, the water content and nonfreezing water are only weakly dependent on temperature from 276 to 333 K. In the samples based on II, with various ratios of the hydrophilic and hydrophobic segments, there is a strong decrease in solubility with temperature and a steep drop above 303 K. The nonfreezing water exhibits a parallel trend. This behavior is interpreted in terms of the temperature-dependent phase compatibility of the polyethylene oxide and polypropylene oxide segments of II. © 1993 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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