Blends of poly(vinyl chloride) (PVC) and polyesteramides (PEA), based on e-caprolactam and e-caprolactone, were prepared to improve the notch impact strength of PVC. Miscibility of components was assessed from glass transition temperature and is limited by the amount of PEA in the blend and by the content of e-caprolactam structural units in PEA. The effects of the content and type of PEA on their thermal stability and notched impact strength were also investigated. The impact strength of the PVC blends reaches its maximum at an equimolar lactam to lactone units ratio in PEA; it decreases with increasing content of PEA in the blend. An admixture of a small amount of poly(e-caprolactam) as a compatibilizer made it possible to prepare PEA-rich PVC blends, exhibiting twice as high notch impact strength, as compared to pure PVC.
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Properties of the blends of Poly(vinyl chloride) (PVC) and poly(e-caprolactone) (PCLO) and copolyesters based on e-caprolactone and L-lactide (LLA) prepared by rolling were studied. Incorporating the LLA units into the structure of PCLO the content of the crystalline phase was controlled. Miscibility of the blends was assessed using DMA, and basic mechanical properties were correlated with the type and content of the polymer plasticizer. The PVC blends containing up to 20 wt parts polyesters were miscible. The presence of the LLA units in the copolyester influenced negatively the thermal stability. On the other hand even small content of copolyester in the blend enhanced the resistivity against aging.
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