Influence of Polyol/Crosslinker Blend Composition on Phase Separation and Thermo-Mechanical Properties of Polyurethane Thin Films

[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-mechan...

Descripción completa

Detalles Bibliográficos
Autores: Arevalo-Alquichire, Said, Morales-Gonzalez, Maria, Navas-Gomez, Kelly, Diaz, Luis E., Valero, Manuel F., Gómez-Tejedor, José-Antonio|||0000-0001-6854-0829, Serrano, María-Antonia|||0000-0002-1508-6893
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/171676
Acceso en línea:https://riunet.upv.es/handle/10251/171676
Access Level:acceso abierto
Palabra clave:Polyurethane
Polyol
Crosslinker
Phase separation
Thermo-mechanical properties
FISICA APLICADA
12.- Garantizar las pautas de consumo y de producción sostenibles
03.- Garantizar una vida saludable y promover el bienestar para todos y todas en todas las edades
Descripción
Sumario:[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.

Similares en LA Referencia