SYNOPSISInterpenetrating polymer networks ( IPN's) , pseudo IPN's and linear blends of urethanecontaining aliphatic polycarbonate (PCU) and polybutadiene (PB) have been prepared and characterized. The simultaneous full IPN's of PCU and PB over the whole composition range (1545% by weight PCU) exhibit a single phase morphology even though the linear chain blends are completely immiscible, as determined by DSC and confirmed by transmission electron microscopy (TEM). However, in both pseudo I P N s of PCU and P B there appeared multiple (melting and glass) transitions in DSC measurements and phase separation was observed by TEM. 0 1992 John Wiley & Sons, Inc. Keywords: interpenetrating polymer networks polycarbonate-urethane polybutadiene 5% ) ) can be prepared even though their linear blends are completely in~ompatible.~
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