Synthesis and characterization of polyurethane anionomers

Un‐ionized polyurethane was obtained by the reaction of an isocyanate‐terminated urethane prepolymer, which was synthesized from 4,4′‐diphenylmethane diisocyanate and poly(oxytetramethylene)‐α,ω‐glycol, with 2,2‐bis(hydroxymethyl)propionic acid. A carboxylate‐based polyurethane anionomer was then de...

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Bibliographic Details
Published in:Journal of applied polymer science 2005-12, Vol.98 (5), p.2144-2148
Main Authors: Matsunaga, Katsuji, Nakagawa, Kazuko, Sawai, Satoshi, Sonoda, Osamu, Tajima, Masahiro, Yoshida, Yasuhiko
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
mechanical properties
Organic polymers
Physicochemistry of polymers
Polycondensation
polyurethanes
Preparation, kinetics, thermodynamics, mechanism and catalysts
thermal properties
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Summary:Un‐ionized polyurethane was obtained by the reaction of an isocyanate‐terminated urethane prepolymer, which was synthesized from 4,4′‐diphenylmethane diisocyanate and poly(oxytetramethylene)‐α,ω‐glycol, with 2,2‐bis(hydroxymethyl)propionic acid. A carboxylate‐based polyurethane anionomer was then derived from the polyurethane by the use of the sodium, potassium, or magnesium salt of acetic acid as a neutralizer. The ionomerization resulted in the following changes in the characteristics of the polyurethane: (1) an increase in the tensile strength, (2) a decrease in the glass‐transition temperature, (3) an increase in the wettability and hygroscopicity with respect to water, and (4) susceptibility to thermal decomposition. A sulfonate‐based polyurethane was also synthesized for comparison with the carboxylate‐based polyurethane. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2144–2148, 2005
ISSN:0021-8995
1097-4628
1097-4682
DOI:10.1002/app.22385