Journal
POLYMER DEGRADATION AND STABILITY
Volume 98, Issue 2, Pages 651-658Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2012.11.009
Keywords
Poly(lactic acid); Plasticization; Oligomeric lactic acid; Ageing
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Funding
- Spanish Ministry of Science [MAT2011-28468-C02-01]
- CDTI [IDI-20110558]
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Poly(lactic acid) (PLA) was melt-blended with a bio-based oligomeric lactic acid (OLA) plasticizer at different concentrations between 15 wt% and 25 wt% in order to enhance PLA ductility and to get a fully biodegradable material with potential application in films manufacturing. OLA was an efficient plasticizer for PLA, as it caused a significant decrease on glass transition temperature (T-g) while improving considerably ductile properties. Only one T-g value was observed in all cases and no apparent phase separation was detected. Films obtained by compression moulding were stored during 3 months under ambient controlled conditions and thermal, mechanical, structural and oxygen barrier properties were studied in order to evaluate the stability of the PLA-OLA films over time. Blends with 20 and 25 wt% OLA remained stable and compatible with PLA within the ageing period. Besides, PLA-20 wt% OLA formulation was the only one which maintained its amorphous state with adequate thermal, mechanical and oxygen barrier properties for flexible films manufacturing. (C) 2012 Elsevier Ltd. All rights reserved.
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