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Bulk polymerization of lactides initiated by aluminium isopropoxide, 3. Thermal stability and viscoelastic properties
Author(s) -
Degée Philippe,
Dubois Philippe,
Jérôme Robert
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980624
Subject(s) - polymer chemistry , dispersity , thermal stability , polymerization , alkoxide , thermogravimetric analysis , materials science , ring opening polymerization , aluminium , polyester , lactide , chemistry , chemical engineering , polymer , catalysis , composite material , organic chemistry , engineering
The thermal stability of poly( L ‐lactide) and L / D ‐lactide stereocopolymers polymerized in bulk with aluminium isopropoxide as initiator was investigated by thermogravimetric analysis, and time and temperature dependence of molecular weight and polydispersity. Compared to poly( L ‐lactide) prepared with stannous octoate as catalyst the thermal stability of polylactides is remarkably enhanced when the ring‐opening polymerization is initiated by aluminium alkoxide. Ultimate mechanical properties and viscoelasticity of these melt‐stable thermoplastics have also been studied in relation to the polyester enantiomeric composition.