Properties of Polyurethane Elastomers with Different Hard/Soft Segment Ratio |
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Authors: | María S. Sánchez-Adsuar M. Mercedes Pastor-Blas José Miguel Martín-Martínez |
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Affiliation: | Adhesion and Adhesives Laboratory, Department of Inorganic Chemistry , University of Alicante , 03080, Alicante, Spain |
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Abstract: | Three polyurethane elastomers (PU) containing different hard/soft (h/s) segment ratios were prepared. The PUs were characterized using Gel Permeation Chromatography (GPC), DSC, Wide Angle X-ray Diffraction (WAXD). Dynamic Mechanical Thermal Analysis (DMTA), and Stress-controlled rheometry. The surface properties were evaluated from contact angle measurements. The PUs were used as raw materials for solvent-based adhesives, whose adhesion properties were measured from T-peel tests of solvent-wiped polyvinyl chloride (PVC)/polyurethane adhesive joints. The increase in the amount of h/s segment ratio affected the structure and morphology of the PUs, reducing the degree of phase separation and the extent of the secondary interactions between polymer chains. The h/s segment ratio determined the thermal, mechanical, rheological and adhesion properties of the PUs. |
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Keywords: | Elastomeric polyurethane hard/soft segment ratio phase separation polyurethane adhesive DMTA rheology T-peel strength |
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