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Molecular Dynamics of PGA Bioabsorbable Polymer During Isothermal Cold Crystallization
Author(s) -
Kortaberria Galder,
Jimeno Amaia,
Arruti Puy,
de la Caba Koro,
Remiro Pedro,
Eceiza Arantxa,
Mondragon Iñaki
Publication year - 2006
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.200690092
Subject(s) - crystallinity , crystallization , amorphous solid , materials science , isothermal process , relaxation (psychology) , polymer , crystallization of polymers , dielectric , thermodynamics , atmospheric temperature range , thermal analysis , analytical chemistry (journal) , thermal , crystallography , composite material , chemistry , physics , chromatography , psychology , social psychology , optoelectronics
An investigation was carried out on the molecular dynamics of poly(glycolide) (PGA) in its completely amorphous state and during isothermal cold crystallization. Experimental results were generated over a wide range of frequency and temperature by broad‐band dielectric spectroscopy (DRS). The variation of the average relaxation time (defined as τ= ½πf max where f max is the frequency at maximum loss for the main α relaxation) has been studied during cold crystallization and the temperature dependence of this average relaxation time for completely amorphous and crystallized samples has been analyzed. This behaviour has been modelled by Havriliak‐Negami and Vogel‐Fulcher equations. The sensitiveness of the segmental dynamics to the degree of crystallinity has been analyzed, taking into account the relaxing segments and the amorphous layers between lamellae. Supporting evidence about the thermal behaviour of the polymers has been obtained with DSC. Complementarily, the evolution of the morphologies obtained during crystallization processes has been followed by optical microscopy.