In the present study, three different newly developed copolymers of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with 20, 40, and 60 mol % contents in 3-hydroxyvalerate (3HV) were produced by biotechnological process mixed microbial cultures (MMCs) using cheese whey (CW), a by-product from dairy industry, as feedstock. The CW-derived PHBV copolyesters first purified then processed soluti...