DOI: 10.1002/app.1986.070310814. Gas transport in poly(vinylidene fluoride): Effects of uniaxial drawing and processing temperature

Gas transport in poly(vinylidene fluoride): Effects of uniaxial drawing and processing temperature

10.1002/app.1986.070310814

Crossref journal-article

Wiley

Journal of Applied Polymer Science (311)

Abstract

AbstractThis paper reports on the gas sorption and transport properties of poly(vinylidene fluoride) (PVF2) and on the effects uniaxial drawing and processing temperature have on these properties. Sorption and transport were first examined for “as‐received” commercial Kynar PVF2 film at 35°C. This film was 54% crystalline by weight. Solubility, diffusion, and permeability coefficients were measured for He, H2, Ar, O2, N2, CH4, and CO2. The solubility coefficient and the diffusion coefficient D were correlated with the Lennard–Jones potential and mean molecular diameter of the gas, respectively. Uniaxial drawing of PVF2 films was performed up to a draw ratio of 3.7 and over the temperature range 75–140°C. Transport properties were correlated with the extent of draw and drawing temperature. The permeability P and D were found to significantly decline with uniaxial drawing; the magnitude of this effect was dependent on both the drawing temperature and the molecular size of the penetrant considered. Roduetions in P and D became progressively more pronounced with increasing molecular diameter and with decreasing drawing temperature (down to a limit of about 75°C), which reflects an increase in effectiveness of drawing at low temperatures. PVF2 films annealed above 75°C showed an increase in P and D as opposed to the effect of drawing. The solubility of various gases in PVF2 was not found to be sensitive to processing treatments such as drawing and annealing, in agreement with the relatively small changes observed in free volume. PVF2 films subjected to various treatments were characterized by DSC, density, birefringence, and dynamic mechanical measurements. Gas transport measurements appear to provide a more sensitive and hence more viable measure of the effectiveness of drawing than these other techniques. Drawing PVF2 in the melt state was found to increase P and D, in contrast with the effects observed for solid‐state drawing. The results have been interpreted in terms of existing theories on morphology and microstructure in semicrystalline polymers.

Bibliography

ElâHibri, M. J., & Paul, D. R. (1986). Gas transport in poly(vinylidene fluoride): Effects of uniaxial drawing and processing temperature. Journal of Applied Polymer Science, 31(8), 2533â2560. Portico.

Authors 2

M. J. El‐Hibri (first)
D. R. Paul (additional)

References 54 Referenced 46

10.1002/app.1985.070300912
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10.1002/pol.1959.1204113805
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{'key': 'e_1_2_1_6_2', 'first-page': '69', 'volume-title': 'Flow‐Induced Crystallization in Polymer Systems', 'author': 'Hay J. N.', 'year': '1979'} / Flow‐Induced Crystallization in Polymer Systems by Hay J. N. (1979)
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{'key': 'e_1_2_1_14_2', 'first-page': '809', 'author': 'Baranor V. G.', 'year': '1969', 'journal-title': 'Vysokomol. Soedin'} / Vysokomol. Soedin by Baranor V. G. (1969)
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{'key': 'e_1_2_1_41_2', 'first-page': '1254', 'volume': '12', 'author': 'Kosmynin B. P.', 'year': '1970', 'journal-title': 'Vysokomol. Soyed.'} / Vysokomol. Soyed. by Kosmynin B. P. (1970)
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10.1016/0032-3861(80)90237-2 / Polymer by McGrath J. C.

Dates

Type	When
Created	22 years, 4 months ago (April 15, 2003, 11:10 a.m.)
Deposited	1 year, 10 months ago (Sept. 29, 2023, 8:07 a.m.)
Indexed	3 days, 17 hours ago (Aug. 22, 2025, 12:45 a.m.)
Issued	39 years, 2 months ago (June 1, 1986)
Published	39 years, 2 months ago (June 1, 1986)
Published Online	22 years, 5 months ago (March 9, 2003)
Published Print	39 years, 2 months ago (June 1, 1986)

Funders 0

None

BibTeX

@article{El_Hibri_1986, title={Gas transport in poly(vinylidene fluoride): Effects of uniaxial drawing and processing temperature}, volume={31}, ISSN={1097-4628}, url={http://dx.doi.org/10.1002/app.1986.070310814}, DOI={10.1002/app.1986.070310814}, number={8}, journal={Journal of Applied Polymer Science}, publisher={Wiley}, author={El‐Hibri, M. J. and Paul, D. R.}, year={1986}, month=jun, pages={2533–2560} }

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