Abstract
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.
Highlights
Polyurethanes (PUs) are a special and outstanding group of polymers with a wide range of applications owing to their particular physical and chemical properties, such as automotive, construction, furniture, insulation, textile, [1] and biomedical devices
We studied the influence of polyol crosslinker composition on polyurethane properties through a mixture design coupled with a surface response analysis [2]
There, we studied the physic-chemical and mechanical properties of PUs based on polycaprolactone diol and polyethylene glycol, as polyols, and pentaerythritol, as crosslinkers
Summary
Polyurethanes (PUs) are a special and outstanding group of polymers with a wide range of applications owing to their particular physical and chemical properties, such as automotive, construction, furniture, insulation, textile, [1] and biomedical devices. Previous research has described this segregation as a function of the composition and chemical structure of monomers, and its effect on PU properties. E.g., Klinedinst, D. et al [4] studied the effects of varying the SS molecular weight and overall HS content thermoplastic segmented PUs. Previous research has described this segregation as a function of the composition and chemical structure of monomers, and its effect on PU properties. E.g., reduction of polyol length or molecular weight in polycaprolactone diol based PUs reduce the crystallization of soft segment [7]. There, we studied the physic-chemical and mechanical properties of PUs based on polycaprolactone diol and polyethylene glycol, as polyols, and pentaerythritol, as crosslinkers. We studied the phase separation and thermomechanical properties of the same PU compositions to enhance comprehension of PUs performance
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