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RESEARCH PRODUCT

Renewable polyol obtained by microwave-assisted alcoholysis of epoxidized soybean oil: Preparation, thermal properties and relaxation process

Diana FaveroCarlos A. FigueroaThiago BarcellosM. CarsíOtávio BianchiClara M. GómezMaria J. SanchisVictória R.r. Marcon

subject

Acid valuefood.ingredientMaterials scienceThermal properties02 engineering and technologyDielectric relaxation spectroscopy010402 general chemistry01 natural sciencesSoybean oilGel permeation chromatographychemistry.chemical_compoundfoodMaterials Chemistry13.- Tomar medidas urgentes para combatir el cambio climático y sus efectosPhysical and Theoretical ChemistrySoybean oil polyolSpectroscopyPolyurethane021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic Materials02.- Poner fin al hambre conseguir la seguridad alimentaria y una mejor nutrición y promover la agricultura sostenibleEpoxidized soybean oil08.- Fomentar el crecimiento económico sostenido inclusivo y sostenible el empleo pleno y productivo y el trabajo decente para todos12.- Garantizar las pautas de consumo y de producción sostenibles07.- Asegurar el acceso a energías asequibles fiables sostenibles y modernas para todosChemical engineeringchemistryHydroxyl valueMAQUINAS Y MOTORES TERMICOS0210 nano-technologyGlass transitionMicrowave-assisted alcoholysisSaponification

description

[EN] The soybean oil polyol (SOP) use as feedstock in the polyurethane industry has been recently emphasized due to its excellent resistance to hydrolysis, which is also applicable in coatings and thermal insulation. In this article, the SOP was obtained by a very fast microwave-assisted alcoholysis of epoxidized soybean oil (ESO). The preparation method, thermal properties, and relaxation process were evaluated. High yields as opening and consumption epoxy group and selectivity of 99.8 mol%, 985 mol%, and 71.2 mol% were obtained. Through titrations, nuclear magnetic resonance and gel permeation chromatography were identified parameters as 0.32 mg KOH.g(-1) acid number, 190 mg KOH.g(-1) hydroxyl number, 150 mg KOH.g(-1) saponification index, 0.17 wt% water content, 1463 g.mol(-1) molecular weight, 4.98 average functionality, 2.4 x 10(-5) mPa.s(-1) viscosity at 333 K and 1.00 g.cm(-3) density. The dielectric relaxation spectroscopy allowed identifying the alpha-relaxation process with a 193.5 K glass transition (T-g), 63.2 fragility index and 234.1 kJ mol(-1) activation energy associated with T-g from the dynamic fragility index. The ionic conductivity temperature dependence on SOP obeys Arrhenius behavior. In summary, the SOP structure and thermal relaxation parameters determination are fundamental for the understanding of the structure-properties relationship of renewable polyurethanes. (C) 2019 Published by Elsevier B.V.

yearjournalcountryeditionlanguage
2019-07-01
10.1016/j.molliq.2019.04.078https://dx.doi.org/10.1016/j.molliq.2019.04.078