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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/10272

Title: Structure Versus Properties Relationship of Poly(lactic acid). I. Effect of Crystallinity on Barrier Properties
Authors: DRIESKENS, Marjoleine
Peeters, Roos
Franco, Dirk
Lemstra, Pieter J.
Hristova-Bogaerds, Denka G.
Issue Date: 2009
Abstract: Poly(lactic acid) is at present the most promising and commercially available bio-based and biocompostable (bio)plastic. The properties of PLA, however, are rather poor, notably its low glass transition temperature T-g of similar to 55 degrees C, its intrinsic low crystallization rate and the limited barrier properties with respect to water, oxygen and carbon dioxide in comparison with to oil-based counterparts, notably polyesters (PET). In this manuscript we address the question of what could ultimately be achieved in terms of barrier properties when PLA is crystallized fully. In fact, this question is rather academic in view of the long crystallization/annealing times needed to obtain maximum crystallinity but serves the purpose of better understanding current limits and notably a better understanding of the role of crystallinity on the barrier properties. A correlation is made between crystallization, various morphological parameters and the barrier properties of PLA. Crystallization of PLA causes a decrease of the oxygen permeability, but not in linear proportion with the decrease in amorphous volume. We explain this in terms of influence of the space filling and the inner crystalline structure on gas transport properties. Furthermore we suggest that the presence of a rigid amorphous fraction with lower density can have strong impact on PLA gas permeability, in particular on the gas solubility coefficient of PLA. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 2247-2258, 2009
Notes: [Lemstra, Pieter J.; Hristova-Bogaerds, Denka G.] Eindhoven Univ Technol, Dept Chem Engn & Chem, NL-5600 MB Eindhoven, Netherlands. [Drieskens, Marjoleine; Mullens, Jules] Hasselt Univ, Inst Mat Res, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium. [Drieskens, Marjoleine; Peeters, Roos; Franco, Dirk] Xios Hogesch Limburg, Packaging Ctr, Dept Ind Sci & Technol, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/10272
DOI: 10.1002/polb.21822
ISI #: 000271670600009
ISSN: 0887-6266
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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