The blends of the same virgin and recycled polymer, (homopolymer or "monopolymer" blends), show rheological and mechanical properties in most cases between those of the two components athough, in general, lower than those expected on the basis of additivity rules. In some cases, however, a minimum observed in some property versus composition curves is correlated with the change of the cryustalline morphology induced by structural differences of the two components and due to different molecular weights and, in particular, the presence of oxygenated groups. In this chapter, the main properties of some homopolymer blends will be reviewed by considering, in particular, the influence of composition, structure and morphology of the recycled components on the properties of these blends.
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