Barrier properties of poly(lactic acid) and its morphological changes induced by aroma compound sorption

Colomines, Gaël; Ducruet, Violette; Courgneau, Cécile; Guinault, Alain; Domenek, Sandra

doi:10.1002/pi.2793

Cited by 93 publications

(102 citation statements)

References 48 publications

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“…Neat PLA oxygen barrier properties are in accordance with published data [54,[60][61][62][63][64][65]. Interestingly, the inclusion of at least 10 wt% of lignin yielded a decrease in oxygen permeability of around 20 %.…”

Section: Composite Materials Characteristicssupporting

confidence: 77%

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

et al. 2013

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Due to their polyphenolic structure lignins bear a number of interesting functional properties, such as antioxidant activity. Natural antioxidants are very much looked for in the aim of protection of light or oxygen sensitive goods and are being used in active packaging. Poly(lactide) (PLA)-lignin films were prepared by twin screw extrusion followed by thermo-compression using two different commercial sources of alkali lignins obtained from gramineous plants. A good dispersion of lignin in the matrix was observed. Mechanical properties of the compounded material were merely diminished and oxygen barrier properties slightly enhanced. The chromatographic study of the lignins revealed that the low molecular weight fraction of both lignins increased during the polymer processing. The migration of low molecular weight compounds in an ethanol/water solution simulating fatty foodstuff was performed and the antioxidant activity of the extract was analysed. It was found that the activity increases with increasing severity of the heat treatment because of the generation of free phenolic monomers during processing. These results open an interesting way for application of lignins as an active compound in packaging materials. Lignins do not impair the mechanical and barrier performance of the polymer and the plastics processing even allows for the generation of active substances.

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Section: Composite Materials Characteristicssupporting

confidence: 77%

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

et al. 2013

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“…17 On the other hand, Colomines et al reported that crystallinity had no effect on the O 2 barrier property of PLA. 18 Some authors have suggested that the barrier properties are dependent on the polymorphic structure of PLA due to differences of molecular packing between  and  crystalline forms. 19 This result is supported by the PALS observations of Del Rio et al in which a dedensification of the amorphous phase is identified mainly during  crystallization due to RAF creation.…”

Section: Introductionmentioning

confidence: 99%

Structural Dependence of the Molecular Mobility in the Amorphous Fractions of Polylactide

et al. 2014

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Fragilityindex and cooperativity length characterizing the molecular mobility in the amorphous phase are for the first time calculated in drawn polylactide (PLA). The microstructure of the samples is investigated from wide-angle X-ray scattering (WAXS) whereas the amorphous phase dynamics are revealed from broadband dielectric spectroscopy (BDS) and temperature-modulated differential scanning calorimetry (TMDSC). The drawing processes induce the decrease of both cooperativity and fragility with the orientation of the macromolecules. Post-drawing annealing reveals an unusual absence of correlation between the evolutions of cooperativity length and fragility. The cooperativity length remains the same compared to the drawn sample while a huge increase of the fragility index is recorded. By splitting the fragility index in a volume contribution and an energetic contribution, it is revealed that the amorphous phase in annealed samples exhibits a high energetic parameter, even exceeding the amorphous matrix value. It is assumed that the relaxation process is driven in such a way that the volume hindrance caused by the thermomechanical constraint is compensated by the acceleration of segmental motions linked to the increase of degrees of freedom. This result should also contribute to the understanding of the constraint slackening in the amorphous phase during annealing of drawn PLA, which causes among others the decrease of its barrier properties.

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“…Block-copolymers can be produced by reactive extrusion of the polymers with peroxides, as done for PLA/PBAT, PLA/PBS and PLA/PCL blends. [72][73][74] To alter the live-time of generated radicals and therefore alter the possibility of diffusion, so-called 'vector-fluids' were used. 66 Additionally, 'surfactants' based on ambipolar molecules with a miscible polar component were used.…”

Section: Part IImentioning

confidence: 99%

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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Biopolymers for packaging applications offer many advantages and are therefore of increasing interest. In order to develop a sustainable alternative for petrochemical-based polymers the biobased and biodegradable polymers, the focus of this work are polyhydroxybutyrate-co-valerate (PHBV) and polylactic acid (PLA) (and copolymers). Blending of these two biopolymers was reviewed under thermodynamic aspects and backed with own results. Additionally, different ways of improving the miscibility were performed by compatibilisers, peroxides, transesterification catalysts, and by blending PHBV with modified molecular weight. These blends were extruded as cast films, and characterised by means of mechanical and barrier properties. This study analyses the miscibility of PLA and PHB-copolyester (with approximately equal molar masses) and reports on the unusually high barrier properties in PLA and PHBV blends. However, the quality of blending, especially regarding barrier properties to interphase boundaries, depends on the compatibility of the components and the morphology of the blend. Our results suggest that a PHBV content of 20-35 % in PLA is the most suitable blend system in terms of compatibility and high barrier properties.

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Barrier properties of poly(lactic acid) and its morphological changes induced by aroma compound sorption

Cited by 93 publications

References 48 publications

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Structural Dependence of the Molecular Mobility in the Amorphous Fractions of Polylactide

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

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