Aspects of the effect of aerosil on the structure and properties of filled network polyurethanes

Abstract The structure and properties of network PUs based on polyoxypropylene glycol, trimethylolpropane and toluylene-2,4- or diphenylmethane-4,4′-diisocyanate cured in presence of different amounts of Aerosil have been studied. The possibility of evaluating the contribution of the two types of specific bonds to the network structure of filled PUs is demonstrated. Aerosil has a fundamentally different influence on the formation of the network structure,of polymers obtained from diisocyanates of symmetrical and non-symmetrical structure, reflected in the values of the effective density of the PU cross link.