Transport Behavior of Polyurethane Elastomers Containing Different Contents of Hyperbranched Structure

Several polyurethane elastomers containing different contents of hyperbranched structure were synthesized by the second pseudo generation of hyperbranched polyester polyol (HBPE) as a newfangled crosslinking agent. The transport behavior of these networks was studied by sorption experiment using a very aggressive aromatic solvent. The results showed that the diffusion and permeability coefficients of polymers/toluene systems considerably were reduced with increasing HBPE content. The inability of urethane groups to form hydrogen bonds and consequently more phase mixing is the main reason for reduced permeability in the hyperbranched polyurethanes with higher content of HBPE

کلیدواژه ها:

Hyperbranched polyurethane ، permeability ، sorption ، diffusion ، barrier