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Título: | Properties of polyurethanes derived from poly(diethylene glycol terephthalate) |
Autor: | Marcos-Fernández, Ángel CSIC ORCID ; Navarro Crespo, Rodrigo CSIC ORCID ; Benito, Esperanza; Guzmán, Julio CSIC ORCID; Garrido, Leoncio CSIC ORCID | Palabras clave: | Polyurethane elastomers Poly(diethylene glycol terephthalate) Thermal analysis Mechanical analysis Dielectric spectroscopy Gas permeability |
Fecha de publicación: | 2021 | Editor: | Elsevier | Citación: | European Polymer Journal 155: 1-8 (2021) | Resumen: | The synthesis of linear and crosslinked polyurethanes based on ¿,¿-dihydroxypolydiethylene glycol terephthalate (PDET) is described. Prior to the preparation of these materials, a PDET polymer was obtained by conventional condensation reaction between dimethyl terephthalate and diethylene glycol, and a well-characterized fraction of PDET with number average molecular weight of 3,650 g mol-1 was chosen for the synthesis of the polyurethanes. Specifically, three polyurethanes were prepared: a pure linear polyurethane by reaction of PDET with 4,4¿ -diphenylmethane diisocyanate (MDI), a chain extended polyurethane obtained with MDI, PDET and 1,4-butanediol as chain extender, and a crosslinked polyurethane synthesized from PDET and a polyfunctional isocyanate. Thermal, mechanical, dielectric and gas transport properties of the polyurethanes were studied, showing excellent performance. In particular, rubber-like flexible materials were obtained with elongation values over 1000%, due to the low glass transition temperature of PDET. Furthermore, it was observed that these materials, in particular the crosslinked polyurethane, behave as gas barriers. | Versión del editor: | http://dx.doi.org/10.1016/j.eurpolymj.2021.110576 | URI: | http://hdl.handle.net/10261/245301 | DOI: | 10.1016/j.eurpolymj.2021.110576 | Identificadores: | doi: 10.1016/j.eurpolymj.2021.110576 issn: 0014-3057 |
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