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FT-IR spectra of PPF2000 (Mn 2000 g/mol), PCL2000 (Mn 2000 g/mol), copolymers 16 (PPF2000-co-PCL2000R0.3), copolymer 17 (PPF2000-co-PCL2000R0.5) and copolymer 18 (PPF2000-co-PCL2000R0.75). As marked, C=C stretching at 1654 cm-1 and carbonyl stretching at 1720 cm-1 were all evident in spectra of PPF2000 and three copolymers. Methylene absorption at 2940 cm-1 can be found in all the polymers with the strongest one in PCL2000 due to the highest methylene content in PCL backbone.
