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Reactive Extrusion of Stereocomplexed Poly‐ L , D ‐lactides: Processing, Characterization, and Properties
Author(s) -
Gallos Antoine,
Fontaine Gaëlle,
Bourbigot Serge
Publication year - 2013
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201200271
Subject(s) - reactive extrusion , transesterification , materials science , crystallinity , tacticity , monomer , polymer chemistry , polymerization , lactide , extrusion , catalysis , chemical engineering , organic chemistry , polymer , composite material , chemistry , engineering
This work reports a facile route to synthesize homochiral and stereocomplexed polylactide by reactive extrusion. The effect of the polymerization catalyst (combination of tin(II)octanoate and triphenylphosphine) before and after its deactivation is discussed. Poly‐ L ‐lactide (PLLA) exhibits homochiral crystallinity and diblock poly‐ L , D ‐lactide (PDLLA) exhibits stereocomplex crystallinity. The presence of residual monomer leads to a plasticizing effect, reducing glass transition temperature ( T g ). Changes of the tacticity ( L , D ‐tacticity) of the stereocomplex are due to the transesterification reactions between L and D units. Deactivation of the catalyst reduces transesterification reactions and preserves the polylactide stereocomplex upon heating.