Synthesis and characterization of cross-linked poly(esterurethane)s for
Polimery 2010, No 9, 634
Cross-linked poly(esterurethane) elastomers (PEURs) have been synthesized in a two-step synthesis. In the first step poly(ethylene adipate) diol was reacted with 4,4'-diphenylmethane diisocyanate, then the obtained prepolymers were chain extended with bifunctional precursor (1,3-propane diol or 1,5-pentane diol) chains and a trifunctional cross-linker (glycerine) at stoichiometric ratios, resulting in a series of cross-linked products with various hard segment (HS) of various structure and content. Their thermal and mechanical properties were determined. Due to phase separation and cross-linked hard segments, propane diol based polyurethane exhibited high mechanical properties. The replacement of propane diol with pentane diol had a negative effect on these mechanical properties. The described cross-linked PEURs possessed strain/shape recovery properties.
Key words: poly(esterurethane)s elastomer, cross-linking, mechanical properties, thermal behavior, shearing stress deformation, shape recovery.
Synthesis and characterization of cross-linked poly(esterurethane)s for elastomeric bearings