Thermally crosslinked polymer blends of polyurethane and chlorobutyl elastomers (sulfur cure)

Blends of polyurethane with chlorobutyl elastomer prepared by three differe nt blending techniques have been studied in the entire composition range. T he properties of the blends showed that the blending technique plays an imp ortant role in determining the blend properties. IR spectral analysis revea led that interchain crosslinking is possible in this blend system upon heat treatment. Thermal stability of blends prepared by preheating the preblend was increased and the degradation process was retarded. Extractability of the single phase, by solvent, was also limited significantly in the case of the preheated preblended sample, probably due to phase adhesion. (C) 2001 Society of Chemical Industry.