Impact of Interface Interactions on a Structure Formation of The Nanostructured Poly(Urethane-Urea) - Poly(Vinyl Chloride) Blends Filled with Modified N anosilica

Dimethyldichlorosilane (DMCS) modified AM-300 nanosilica has a minor destabilization effect on C=Oδ- ···αHc)+ network and slightly reduces the tensile properties of PUU-I/PVC composites compared to composites filled with unmodified hydrophilic A-300 nanosilica. Introducing modified filler into PUU-2/PVC blend weakens intermolecular interactions at the interface. It sharply reduces the strength of filled polymer composites due to adsorption interactions of residual polar chlorine groups of DMCS modifier and proton donor NH groups of hard segments of the elastomer. At the same time, intracomponent C=Oδ-···αHc)+ interactions are practically unchanged and do not affect phase separation processes and functional characteristics of filled polymer nanocomposite films. It was found the optimal content of the filler for PUU-I/PVC blend reaches 3 wt.% for AM-300 or 1 wt. % for neat nanosilica. However, for PUU-2/PVC a filler content should not overcome 1 wt. %. So, the impact of interface interactions on tensile properties of nanostructured polymer blends depends mainly on the nature of the nanosilica modifier as well as the chemical structure of the poly(urethane-urea) matrix.