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Novel Biodegradable Copolyesters Containing Blocks of Poly(3‐hydroxyoctanoate) and Poly( ε ‐caprolactone): Synthesis and Characterization
Author(s) -
Timbart Laurianne,
Renard Estelle,
Langlois Valérie,
Guerin Philippe
Publication year - 2004
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200400104
Subject(s) - copolymer , polymer chemistry , caprolactone , polyester , differential scanning calorimetry , ring opening polymerization , chemistry , thermoplastic elastomer , materials science , polymer , organic chemistry , physics , thermodynamics
Summary: Novel biodegradable polyester block copolymers have been synthesized by using well‐defined poly(3‐hydroxyoctanoate) (PHO) oligomers having a hydroxyl end group and an ester end group with $\overline M _{\rm n}$ values of 800, 2 500, 5 300, 8 000, or 20 000 as an elastomeric soft segment and poly( ε ‐caprolactone) as a more crystalline segment. These PHO oligomers prepared by methanolysis were subjected to block copolymerization with ε ‐caprolactone. The chemical structure of the copolymers was confirmed by 1 H NMR and 13 C NMR spectroscopy. All the copolyesters are semi‐crystalline and two T g were observed by differential scanning calorimetry when the molecular weight of the PHO block is about 20 000.