Ageing of poly(lactic acid) films plasticized with commercial polyadipates

Martino, Verónica P.; Ruseckaite, Roxana Alejandra; Jiménez, Alfonso

doi:10.1002/pi.2556

Cited by 51 publications

(52 citation statements)

References 32 publications

(32 reference statements)

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“…Some studies showed a decrease in water and oxygen permeability for different types of PLA (e.g. totally amorphous, semicrystalline, with/without plasticizers) as a result of PLA structure densification during physical ageing [56][57][58]. Based on these considerations, it could be hypothesized that such decrease in the diffusion properties originated from the acceleration of physical ageing during CO 2 sorption.…”

Section: Barrier Propertiesmentioning

confidence: 99%

How high pressure CO2 impacts PLA film properties

Rocca-Smith¹,

Lagorce-Tachon²,

Iaconelli³

et al. 2017

Express Polym. Lett.

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Abstract. This work investigated the sorption and the diffusion properties of CO 2 under high pressure and the further modifications induced in Poly(lactic acid) (PLA) thin layers. Poly(ethylene terephtalate) (PET) was also considered for comparative purposes. Firstly, from thermodynamic equilibrium, the CO 2 sorption isotherm (two sorption-desorption cycles, up to 25 bar, at 25°C) gave strong evidence of a physisorption mechanism and of a hysteresis phenomenon. Infrared spectroscopy analysis confirmed that no chemical reaction occurred. Secondly, from the kinetics aspect, the CO 2 diffusion coefficient was found around 10 -13 m 2 ·s -1 and was slightly faster for sorption compared to desorption. Additionally, when CO 2 sorption occurred, the PLA structure and its functional properties were modified due to plasticization and swelling. CO 2 plasticization reduced the glass transition temperature of PLA and accelerated the physical ageing of the polymer. These results are therefore of significant importance in industrial processing and applications which involve close contact between CO 2 and PLA.

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Section: Barrier Propertiesmentioning

confidence: 99%

How high pressure CO2 impacts PLA film properties

Rocca-Smith¹,

Lagorce-Tachon²,

Iaconelli³

et al. 2017

Express Polym. Lett.

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“…The elongation at break decreased slightly for the PLA/lignin SARKANDA formulation with the increase of lignin content. However, as PLA on itself is already a brittle material [54][55][56][57][58], further decrease was difficult to detect. The measured strain at break values of neat PLA data were in agreement with the data given by the provider in the PLA 2002D datasheet and with literature results [56,59].…”

Section: Composite Materials Characteristicsmentioning

confidence: 99%

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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“…Concerning food 65 contact materials, there are several requirements to be 66 satisfied by additives, such as being non-toxic substances, 67 showing good miscibility with the polymer, providing high 68 tensile strength, ductility, and suitable thermal properties. [10]o r 75 polyadipates [11,12], but their compatibility with PLA 76 is limited and the possibility of incorporation with no 77 phase separation is restricted to concentrations lower than 78 20 wt% limiting their potential properties in food pack-79 aging. In general, it has been accepted that amounts from 80 10 to 20 wt% of plasticizers are required to provide a 81 substantial reduction of the PLA glass transition tempera-82 ture (T g ) as well as to obtain adequate mechanical prop-83 erties for films manufacturing.…”

Section: Details Requiredmentioning

confidence: 99%

“…This is an 289 important parameter for further blending with PLA. In 290 general, higher viscosities result in more difficulties during 291 blending, but it should be pointed out that the obtained 292 value for this parameter ranges in the same order to those 293 normally presented by polyadipates, which were success-294 fully blended with PLA in previous works [11,12]. 295 The number-average molar mass (Mn) of OLAs ranged 296 from 671 to 957 Da, with polydispersity indexes below 1.5 297 in all cases (Table 2).…”

mentioning

confidence: 99%