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

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...

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Published inPolymers Vol. 12; no. 3; p. 666
Main Authors Arévalo-Alquichire, Said, Morales-Gonzalez, Maria, Navas-Gómez, Kelly, Diaz, Luis E, Gómez-Tejedor, José A, Serrano, María-Antonia, Valero, Manuel F
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 17.03.2020
MDPI
Subjects
Atomic force microscopy
Chemical composition
crosslinker
Crosslinking
Crystallization
Damping capacity
Diisocyanates
Dynamic mechanical analysis
Fourier transforms
Hydrogen
Hydroxyapatite
Mechanical properties
Molecular weight
Phase separation
Polycaprolactone
Polyethylene glycol
Polymerization
polyol
polyurethane
Polyurethane resins
Spectrum analysis
thermo-mechanical properties
Thermodynamic properties
Thermogravimetric analysis
Thermomechanical properties
Thin films
X-ray scattering
United Kingdom > UK
United States > US
phase separation
polyurethane
crosslinker
polyol
thermo-mechanical properties
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Summary: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.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym12030666