Influence of Polyol/Crosslinker Blend Composition on Phase Separation and Thermo-Mechanical Properties of Polyurethane Thin Films
| Autor: | María-Antonia Serrano, Luis E. Díaz, Said Arévalo-Alquichire, Kelly Navas-Gómez, José A. Gómez-Tejedor, Maria Morales-Gonzalez, Manuel F. Valero |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Polyurethane Materials science Polymers and Plastics Phase separation Polyethylene glycol macromolecular substances Pentaerythritol Article lcsh:QD241-441 chemistry.chemical_compound Polyol lcsh:Organic chemistry Crosslinker 03.- Garantizar una vida saludable y promover el bienestar para todos y todas en todas las edades chemistry.chemical_classification technology industry and agriculture Thermo-mechanical properties General Chemistry Dynamic mechanical analysis 12.- Garantizar las pautas de consumo y de producción sostenibles chemistry Chemical engineering FISICA APLICADA Polycaprolactone Isophorone diisocyanate |
| Zdroj: | Polymers, Vol 12, Iss 3, p 666 (2020) Polymers Volume 12 Issue 3 RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.3390/polym12030666 |
| Popis: | [EN] Polyurethanes (PUs) from Polyethylene glycol (PEG) and polycaprolactone diol (PCL) and a crosslinker, Pentaerythritol (PE), were synthetized with isophorone diisocyanate (IPDI). In this study, we investigated the effect of polyol and crosslinker composition on phase separation and thermo-mechanical properties. The properties were studied through dynamic mechanical analysis, X-ray scattering, atomic force microscopy (AFM), and thermogravimetric analysis (TGA). The results showed changes in PUs properties, microphase structure, and separation due to the composition of polyol/crosslinker blend. So, the largest concentration of PE produced multimodal loss factor patterns, indicating segment segregation while PUs with a PEG/PCL = 1 displayed a monomodal loss factor pattern, indicating a homogeneously distributed microphase separation. Additionally, the increase of the PEG concentration enhanced the damping capacity. On the other hand, agglomeration and thread-like structures of hard segments (HS) were observed through AFM. Finally, the thermal behavior of PUs was affected by chemical composition. Lower concentration of PE reduced the crosslinking; hence, the temperature with the maximum degradation rate. This work was supported by: Universidad de La Sabana (Grant number ING-176-2016); COLCIENCIAS, today Minister of Science, Technology and Innovation of the republic of Colombia, (Grant number 808-2018); Fondo Francisco Jose de Caldas (Contract number CT22-2017). CIBER-BBN is an initiative funded by the VI National R&D & I Plan 2008-2011, "IniciativaIngenio 2010", Consolider Program. CIBER actions are financed by the "Instituto de Salud Carlos III" with assistance from the European Regional Development Fund. Document |
| Databáze: | OpenAIRE |
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