Thermal and mechanical profile of cast films from waterborne polyurethanes based on polyether block copolymers

Environmental considerations have been the cause of increasing research and development of waterborne polymer systems for many different applications, particularly as coatings for several kinds of substrates. In this work, waterborne polyurethanes (WPU) based on block copolymers of ethylene glycol a...

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Bibliographic Details
Published in:Journal of materials science 2009-03, Vol.44 (5), p.1317-1323
Main Authors: Santos, Cristiane C., Delpech, Marcia C., Coutinho, Fernanda M. B.
Format: Article
Language:English
Subjects:
Block copolymers
Characterization and Evaluation of Materials
Classical Mechanics
Crystallography and Scattering Methods
Diisocyanates
Ethylene glycol
Hydrazines
Materials Science
Mechanical properties
Polymer Sciences
Polyurethane resins
Propylene
R&D
Research & development
Solid Mechanics
Substrates
Thermal resistance
Thermal stability
Thermogravimetry
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Summary:Environmental considerations have been the cause of increasing research and development of waterborne polymer systems for many different applications, particularly as coatings for several kinds of substrates. In this work, waterborne polyurethanes (WPU) based on block copolymers of ethylene glycol and propylene glycol (EG-b-PG), with 25% of EG segments, poly(propylene glycol), dimethylolpropionic acid, isophorone diisocyanate, and hydrazine, as chain extender, were obtained in the absence of organic solvent. Thermal stability, by thermogravimetry, and mechanical properties of cast films obtained from the aqueous dispersions were evaluated. The degradation process started above 200 °C for all samples. It was verified that the block copolymer improved the thermal resistance but diminished the mechanical resistance of the WPU materials.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-009-3272-7