[en] Starting from calcium sulfate (gypsum) as fermentation by-product of lactic acid production process, high performance composites have been produced by melt-blending polylactide (PLA, L/D isomer ratio of 96:4) and ß-anhydrite II (AII) filler, that is, calcium sulfate hemihydrate previously dehydrated at 500 °C. Characterized by attractive mechanical and thermal properties due to good filler dispersion throughout the polyester matrix, these composites are interesting for potential use as biodegradable rigid packaging. Physical characterization of selected composites filled with 20 and 40 wt % AII has been performed and compared to processed unfilled PLA with similar amorphous structure. State of dispersion of the filler particles and interphase characteristic features have been investigated using light microscopy (LM) and scanning electron microscopy (SEM). Addition of AII did not decrease PLA thermal stability as revealed by thermogravimetry analyses (TGA) and allowed reaching a slight increase of PLA crystallizability during melt crystallization and upon heating from the glassy, amorphous state (DSC). It was found by thermomechanical measurements (DMTA) that the AII filler increased pronouncedly storage modulus (E') of the composites in comparison with PLA in a broad temperature range. The X-ray investigations showed stable/unchanged crystallographic structure of AII during processing with molten PLA and in the composite system. The notable thermal and mechanical properties of PLA-AII composites are accounted for by the good filler dispersion throughout the polyester matrix confirmed by morphological studies, system stability, and favorable interactions between components.
Disciplines :
Chemistry
Author, co-author :
Pluta, M.
Murariu, Marius
Da Silva Ferreira, M.
Alexandre, M.
Galeski, A.
Dubois, Philippe ; Université de Mons > Faculté des Sciences > Matériaux Polymères et Composites
Language :
English
Title :
Polylactide compositions: II. Correlation between morphology and main properties of PLA/calcium sulfate composites
Publication date :
01 October 2007
Journal title :
Journal of Polymer Science. Part B, Polymer Letters
ISSN :
0449-2986
Publisher :
Interscience Publishers, United Kingdom
Volume :
45
Issue :
19
Pages :
2770-2780
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S816 - Matériaux Polymères et Composites
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Commentary :
Publié en ligne le 27 août 2007
Lecture en ligne: http://onlinelibrary.wiley.com/doi/10.1002/polb.21277/pdf
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