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Open AccessArticle

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

1
Energy, Materials and Environmental Group, GEMA, Faculty of engineering, Universidad de La Sabana, 140013 Chía, Cundinamarca, Colombia
2
Doctoral program of biosciences, Universidad de La Sabana, 140013 Chía, Cundinamarca, Colombia
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Bioprospecting Research Group, GIBP, Faculty of engineering, Universidad de La Sabana, 140013 Chía, Cundinamarca, Colombia
4
Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
5
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(3), 666; https://doi.org/10.3390/polym12030666
Received: 15 January 2020 / Revised: 9 March 2020 / Accepted: 10 March 2020 / Published: 17 March 2020
(This article belongs to the Special Issue Polymer Structure and Property II)
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. View Full-Text
Keywords: polyurethane; polyol; crosslinker; phase separation; thermo-mechanical properties polyurethane; polyol; crosslinker; phase separation; thermo-mechanical properties
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Arévalo-Alquichire, S.; Morales-Gonzalez, M.; Navas-Gómez, K.; Diaz, L.E.; Gómez-Tejedor, J.A.; Serrano, M.-A.; Valero, M.F. Influence of Polyol/Crosslinker Blend Composition on Phase Separation and Thermo-Mechanical Properties of Polyurethane Thin Films. Polymers 2020, 12, 666.

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