Copoly ureas

Gaina, C., Gaina, V., Ciobanu, C. (2009). Thermal and mechanical characterization of maleimide-fiinctionalized copoly(urethane-urea)s,i ggi ol mj5ci, 113, 3245-3254. 

Versteegen RM, Kleppinger R, Sijbesma RP, Meijer EW (2006) Properties and morphology of segmented copoly(ether urea)s with uniform hard segments. Macromolecules 39 (2) 772-783... 

Typical of these materials are the poly(vinyl thioethers), the poly(vinyl isocyanates), the polyfvinyl ureas) and the poly(alkyl vinyl ketones). Methyl isopropenyl ketone and certain vinylpyridine derivatives have been copoly-merised with butadiene to give special purpose rubbers. 

Visco-elastic (VE) foams are a category of flexible, copoly(urethane-urea) foams which exhibit low resiliency and thus slow recovery post-deformation. They are also often referred to as memory foams. The key characteristics associated with viscoelastic foams are slow recovery, compliant/body conforming, vibration damping, low resilience, temperature sensitivity, and humidity sensitivity [1,2]. 

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