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The possibility of poly(vinyl chloride) (PVC) plasticization and modification by regenerated PVC/polyurethane (PU) blends (PVC/PU R ), obtained after partial thermochemical destruction of the PU foam-backed PVC-sheet (soundproof materials waste), has been studied. The partial thermochemical destruction of the PU foambacked PVC-sheet was carried out using alkanolamine in a one-screw extruder. The destruction product was a thermoplastic mixture of PVC and regenerated linear PUs, applicable for reuse without any purification and fractionation. The influence of processing conditions on structure-property relationships for the PVC/PU R blends was studied using the methods of differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), size exclusion chromatography (SEC), and mechanical testing. It has been established that PVC/PU R blends can be reused as an effective polymer plasticizer for PVC resin (PVC r ) and as a modifier for plasticized PVC (PVC p ). POLYM. ENG. SCI., 45:801-808, 2005.