Properties of polyurethanes derived from poly(diethylene glycol terephthalate)

• Published in: European polymer journal Vol. 155; p. 110576
• Main Authors: Marcos-Fernández, Ángel A., Navarro, Rodrigo, Benito, Esperanza, Guzmán, Julio, Garrido, Leoncio
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 15.07.2021; Elsevier BV
• Subjects: Butanediol; Chemical synthesis; Crosslinking; Dielectric spectroscopy; Diphenyl methane diisocyanate; Elongation; Gas permeability; Gas transport; Glass transition temperature; Isocyanates; MDI derived polyurethane; Mechanical analysis; Mechanical properties; Poly(diethylene glycol terephthalate); Polyethylene terephthalate; Polyurethane; Polyurethane elastomers; Polyurethane resins; Terephthalate; Thermal analysis; Thermoplastics; Transport properties; Poly(diethylene glycol terephthalate); Gas permeability; Dielectric spectroscopy; Thermal analysis; Polyurethane elastomers; Mechanical analysis
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/j.eurpolymj.2021.110576

[Display omitted] •The conformational characteristics of PDET afford elastomeric PDET based PUs.•Polyurethanes with elongation values over 1000% were obtained.•Elastomeric PDET based polyurethanes can be categorized as gas barrier polymers. The synthesis of linear and crosslinked polyurethanes based on α,ω-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.