Permeability of N2, Ar, He, O2 and CO2 through biaxially oriented polyester films - dependence on free volume

E.A. McGonigle, J.J. Liggat, R.A. Pethrick, S.D. Jenkins, J.H. Daly, D. Hayward

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

Permeability, diffusion and solubility coefficients are reported for biaxially orientated polyester films based on poly(ethylene terephthalate) [PET], poly(ethylene naphthalate) [PEN] and copolymers containing PET and PEN moieties. Data for cast amorphous sheets and materials produced with different biaxial draw ratios are compared. The crystallinity of the samples was assessed using differential scanning calorimetry and density measurements. The changes in the void structure at a molecular level were investigated using positron annihilation lifetime spectroscopy (PALS). The variation of the gas diffusion behaviour with the gas used (carbon dioxide, nitrogen, argon, helium and oxygen) reflects the effects of change in morphology on the solubility and diffusivity components of the permeability. The diffusivity of the gas is influenced not only by both the changes in the void size and content at a molecular level, but also by the effects of crystallinity on the percolation behaviour of the gas through the matrix. Changes in the extent of chain alignment also have a profound affect on the solubility of the gas in the matrix. The observed behaviour for the gas permeation can be interpreted as being the result of the complex interplay of changes in the crystalline content, the polymer chain alignment and the void structure of the amorphous phase.
LanguageEnglish
Pages2413-2426
Number of pages13
JournalPolymer
Volume42
Issue number6
DOIs
Publication statusPublished - Mar 2001

Fingerprint

Polyesters
Free volume
Gases
Solubility
Helium
Polyethylene Terephthalates
Positron annihilation
Diffusion in gases
Argon
Carbon Dioxide
Permeation
Polyethylene terephthalates
Differential scanning calorimetry
Carbon dioxide
Polymers
Ethylene
Nitrogen
Copolymers
Spectroscopy
Oxygen

Keywords

  • poly(ethylene terephthalate)
  • poly(ethylene naphthalate)
  • copolymers

Cite this

McGonigle, E.A. ; Liggat, J.J. ; Pethrick, R.A. ; Jenkins, S.D. ; Daly, J.H. ; Hayward, D. / Permeability of N2, Ar, He, O2 and CO2 through biaxially oriented polyester films - dependence on free volume. In: Polymer. 2001 ; Vol. 42, No. 6. pp. 2413-2426.
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abstract = "Permeability, diffusion and solubility coefficients are reported for biaxially orientated polyester films based on poly(ethylene terephthalate) [PET], poly(ethylene naphthalate) [PEN] and copolymers containing PET and PEN moieties. Data for cast amorphous sheets and materials produced with different biaxial draw ratios are compared. The crystallinity of the samples was assessed using differential scanning calorimetry and density measurements. The changes in the void structure at a molecular level were investigated using positron annihilation lifetime spectroscopy (PALS). The variation of the gas diffusion behaviour with the gas used (carbon dioxide, nitrogen, argon, helium and oxygen) reflects the effects of change in morphology on the solubility and diffusivity components of the permeability. The diffusivity of the gas is influenced not only by both the changes in the void size and content at a molecular level, but also by the effects of crystallinity on the percolation behaviour of the gas through the matrix. Changes in the extent of chain alignment also have a profound affect on the solubility of the gas in the matrix. The observed behaviour for the gas permeation can be interpreted as being the result of the complex interplay of changes in the crystalline content, the polymer chain alignment and the void structure of the amorphous phase.",
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Permeability of N2, Ar, He, O2 and CO2 through biaxially oriented polyester films - dependence on free volume. / McGonigle, E.A.; Liggat, J.J.; Pethrick, R.A.; Jenkins, S.D.; Daly, J.H.; Hayward, D.

In: Polymer, Vol. 42, No. 6, 03.2001, p. 2413-2426.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Permeability of N2, Ar, He, O2 and CO2 through biaxially oriented polyester films - dependence on free volume

AU - McGonigle, E.A.

AU - Liggat, J.J.

AU - Pethrick, R.A.

AU - Jenkins, S.D.

AU - Daly, J.H.

AU - Hayward, D.

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N2 - Permeability, diffusion and solubility coefficients are reported for biaxially orientated polyester films based on poly(ethylene terephthalate) [PET], poly(ethylene naphthalate) [PEN] and copolymers containing PET and PEN moieties. Data for cast amorphous sheets and materials produced with different biaxial draw ratios are compared. The crystallinity of the samples was assessed using differential scanning calorimetry and density measurements. The changes in the void structure at a molecular level were investigated using positron annihilation lifetime spectroscopy (PALS). The variation of the gas diffusion behaviour with the gas used (carbon dioxide, nitrogen, argon, helium and oxygen) reflects the effects of change in morphology on the solubility and diffusivity components of the permeability. The diffusivity of the gas is influenced not only by both the changes in the void size and content at a molecular level, but also by the effects of crystallinity on the percolation behaviour of the gas through the matrix. Changes in the extent of chain alignment also have a profound affect on the solubility of the gas in the matrix. The observed behaviour for the gas permeation can be interpreted as being the result of the complex interplay of changes in the crystalline content, the polymer chain alignment and the void structure of the amorphous phase.

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