Permeability of N 2 , Ar, He, O 2 and CO 2 through biaxially oriented polyester films — dependence on free volume

McGonigle, Elizabeth-Anne; Liggat, John; Pethrick, Richard A.; Jenkins, Stephen D.; Daly, John H.; Hayward, D.

doi:10.1016/s0032-3861(00)00615-7

Cited by 127 publications

(93 citation statements)

References 39 publications

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“…. For PET Similar D sorp values were also observed in other studies [40][41][42]. The variability of first sorption was higher than the others cycles, and for desorption steps, the equilibrium was reached faster than for sorption.…”

Section: Diffusion Propertiessupporting

confidence: 86%

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: Diffusion Propertiessupporting

confidence: 86%

How high pressure CO2 impacts PLA film properties

Rocca-Smith¹,

Lagorce-Tachon²,

Iaconelli³

et al. 2017

Express Polym. Lett.

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“…For them, the evolutions of f a are responsible for the transport parameters variations of the drawn samples. Recently, McGonigle et al (2001) performed permeation experiments of various gases (N 2 , Ar, He, CO 2 , O 2 ) in biaxially drawn films of PET and PEN. They observed a decrease of the barrier properties (S and D) with the draw ratio.…”

Section: Effect Of Orientationmentioning

confidence: 99%

Transport Properdines of Gases in Polymers: Bibliographic Review

Klopffer

Flaconnèche

2001

Oil & Gas Science and Technology - Rev. IFP

244

196

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Résumé -Transport de molécules gazeuses dans les polymères : revue bibliographique -Après quelques rappels concernant les lois classiques des phénomènes de transport, cet article, purement bibliographique, présente les différents modèles théoriques proposés pour décrire le mécanisme de transport d'espèces chimiques dans les polymères par diffusion moléculaire. Il s'appuiera ensuite sur de nombreuses études menées antérieurement, pour montrer que la perméabilité des gaz (ou vapeurs organiques) dépend fortement de la structure du polymère (cristallinité, histoire thermomécanique), de la taille et de la nature du pénétrant ainsi que des conditions de température et de pression.Mots-clés : polymère, gaz, perméabilité, diffusion, solubilité. Abstract -Transport Properties of Gases in

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“…The size of the holes corresponds also to molecular radii of diffusing substances (oxygen, nitrogen, carbon dioxide, water); therefore gas transport properties of polymeric materials (e.g. permeability and diffusivity) are often correlated with the size of free volumes and free volume fraction [10][11][12][13]. Moreover, PALS was applied to study the structure of different polymers after γ irradiation [14], thermal [15] and outdoor degradation [16], because usually degradation influences the size and distribution of molecular level free volume holes.…”

Section: Introductionmentioning

confidence: 99%

Hydrolytic Degradation of Poly(L-Lactide-co-Glycolide) Studied by Positron Annihilation Lifetime Spectroscopy and Other Techniques

2006

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Changes of the poly(L-lactide-co-glycolide) structure as a function of degradation time in phosphate-buffered saline for 7 weeks were investigated by gel permeation chromatography, differential scanning calorimetry, nuclear magnetic resonance ( 1 H NMR), and positron annihilation lifetime spectroscopy. Surface properties as wettability by sessile drop and topography by atomic force microscopy were also characterized. Chain-scission of polyester bonds in hydrolysis reaction causes a quite uniform decrease in molecular weight, and finally results in an increase in semicrystallinity. Molecular composition of the copolymer and water contact angle do not change considerably during degradation time. Atomic force microscopy studies suggest that the copolymer degrades by "in bulk" mechanism. The average size of the molecular-level free volume holes declines considerably after one week of degradation and remains constant till the sixth week of degradation. The free volume fraction decreases as a function of degradation time.

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Permeability of N 2 , Ar, He, O 2 and CO 2 through biaxially oriented polyester films — dependence on free volume

Cited by 127 publications

References 39 publications

How high pressure CO2 impacts PLA film properties

How high pressure CO2 impacts PLA film properties

Transport Properdines of Gases in Polymers: Bibliographic Review

Hydrolytic Degradation of Poly(L-Lactide-co-Glycolide) Studied by Positron Annihilation Lifetime Spectroscopy and Other Techniques

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