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Synthesis and structures of cooligo(lactone) macromonomers
Author(s) -
Gopp Udo,
Sandner Barbara,
Schöch Martin,
Schlothauer Klaus,
Pasch Harald,
Ghahary Reza
Publication year - 1998
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19981300111
Subject(s) - lactone , lactide , differential scanning calorimetry , macromonomer , polymer chemistry , chemistry , organic chemistry , copolymer , polymer , physics , thermodynamics
Cooligo(lactone) macromonomers were prepared by cooligomerisation of (S,S)‐3,6‐dimethyl‐1,4‐dioxane‐2,5‐dione (L‐lactide), 1‐oxacyclohexane‐2‐one (δ‐valerolactone) or 1‐oxacycloheptane‐2‐one (ε‐caprolactone), initiated by 2,2‐bis[4‐(2‐hydroxy‐3‐methacryloyloxypropoxy)phenyl]‐propane (BisGMA). Two different reaction ways were used for the synthesis: parallel reaction and step reaction of lactones and L‐lactide. The macromonomers were characterised by differential scanning calorimetry (DSC), size exclusion chromatography (SEC), 1 H‐ and 13 C‐NMR spectroscopy and MALDI‐TOF mass spectrometry. Cooligo(lactone) macromonomers prepared by parallel and by step reaction show different molecular structures resulting in different properties. Their glass transition temperatures depend on the molar ratio of lactide and lactone as well as on the degree of oligomerisation. Macromonomers with high amounts of L‐lactide units are partially crystalline.