engleski

Properties of adhesive polymer compositions in ageing conditions

In our work the degradative changes in properties of polyurethane adhesives based on aliphatic isocianates were defined and compared with similar changes occuring when using aromatic isocyanates. The readily observed PUR adhesive discoloration in situations of its contact with leather does imply the neccesity for the establishing the real proportions of the polyurethane constituents responsible for this ever- present problem. The structure-property relationship of hydroxylterminated polyester-based segmented aliphatic polyurethanes, as a component in adhesive composition were studied using wide angle X-ray diffraction spectroscopy (WAXD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) as well as attanuated total reflectance infrared spectroscopy (ATR-IR) and nuclear magnetic resonance spectroscopy (NMR). The rsults show that crystaline phase in segmented PUR component influence on morphological and structural properties in degradative conditions.

PUR adhesives ; degradation

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