Abstract
Several UV- and heat-curable polyurethane urea amide acrylate polymers were synthesized from 4,4′ diphenyl methane diisocyanate, poly(1,2-ethane diol), poly(1,3-propane diol), poly(1,4-butane diol), 1,6-hexamethylene diamine and acrylic acid. We have investigated the effects of polyol type and of the length of methylenic chain on their properties. The increase of polyol methylenic chain led to a lower glass-transition temperature, an increasing tensile modulus and strength and increased thermal stability. These soft elastic segment structures, in addition to the physical and chemical cross-linked nature of the hard segment, provide enough cross-link sites to have an elastomeric behaviour.
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