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

Polymers

LuisE. Diaz¹  JoséA. Gómez-Tejedor²  María-Antonia Serrano²  ManuelF. Valero³  Maria Morales-Gonzalez³  Kelly Navas-Gómez³  Said Arévalo-Alquichire³ 

[1] Bioprospecting Research Group, GIBP, Faculty of engineering, Universidad de La Sabana, 140013 Chía, Cundinamarca, Colombia;Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;Energy, Materials and Environmental Group, GEMA, Faculty of engineering, Universidad de La Sabana, 140013 Chía, Cundinamarca, Colombia;

关键词: polyurethane;    polyol;    crosslinker;    phase separation;    thermo-mechanical properties;   

DOI  :  10.3390/polym12030666

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown