Sorption and diffusion of organic vapors in two fluoroelastomers

Wang, Ping; Schneider, N. S.; Sung, N. H.

doi:10.1002/(sici)1097-4628(19990228)71:9<1525::aid-app17>3.0.co;2-q

Cited by 13 publications

(2 citation statements)

References 14 publications

(23 reference statements)

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“…Previous work on the sorption and transport of low‐molecular‐weight species in fluoroelastomers mainly refers to organic liquids 6–12 and less often to vapors 13. In this work, we measure the permeability coefficient ( P ), the diffusion coefficient ( D ), and the solubility coefficient ( S ) of DME in various fluoroelastomers at different pressures and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Permeation, diffusion, and sorption of dimethyl ether in fluoroelastomers

Angelis

Sarti

Sanguineti

et al. 2004

J Polym Sci B Polym Phys

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The permeation, diffusion, and sorption of dimethyl ether into a series of commercial fluoroelastomers were characterized at various pressures and temperatures. The polymers under study were based on tetrafluoroethylene and contained various amounts of other perfluorinated monomers: perfluoromethylvinylether, hexafluoropropylene, and a partially fluorinated monomer, vinylidene fluoride (VDF). These polymers were also filled with inorganic particles and cured with different techniques. The permeation rate of dimethyl ether in the elastomers examined, as well as the solubility value, increased as the content of the nonperfluorinated monomer (VDF) increased, and this was consistent with the solubility parameter theory. The diffusion coefficients, at a fixed concentration, had rather similar values for most of the elastomers examined. Both the permeability and diffusivity increased with temperature, and the corresponding activation energies were obtained for two selected polymers. The solubility of dimethyl ether, at a fixed temperature and activity, showed a linear dependence versus the weight fraction of the partially fluorinated monomer (VDF) in the polymeric matrix. The effect of the filler on the sorption and transport properties was also considered: the addition of the filler lowered the permeability and diffusivity, whereas the solubility was generally increased with respect to the crosslinked rubber. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 1987–2006, 2004

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Section: Introductionmentioning

confidence: 99%

Permeation, diffusion, and sorption of dimethyl ether in fluoroelastomers

Angelis

Sarti

Sanguineti

et al. 2004

J Polym Sci B Polym Phys

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show abstract

“…Schneider et al 3 studied sorption and diffusion of diffrent liquid for polyurethane rubber to undrestand the transport mechanism of small molecules through rubber. On the other hand, Myers and Abu–Isa 4 and Wang et al 5 studied swelling behaviour of fluoroelastomers in methanol and mixture of methanol and different polar and nonpolar solvent. Bouvier and Gelus 6 studied the molecular transport of aromatic oil in the temperature interval of ambient to 200°C through cross-linked styrene-butadiene rubber using swelling techniques.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of microstructure of natural rubber/nano-calcium carbonate nanocomposites by solvent transport properties

Ghari¹,

Shakouri²,

Shirazi³

2014

Plastics, Rubber and Composites

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The research on rubber reinforcement is a traditional but vitally essential topic. However, many issues in this aspect are presently still not well understood and explained. Moreover, when rubber reinforcement is obtained by using nanoparticles, it is even more difficult to clearly understand the relationship between the microstructure and properties. The special character of rubber, being a multicomponent system (rubber, vulcanising agent, accelerants, reinforcements, etc.), complicates even more the analysis of the parameters affecting the rubber/nanoparticle composite formation. Therefore, we believe the results obtained by means of transport experiments represent a good approach for understanding the reinforcing capability of nanofillers. The reinforcing capability of nano-CaCO 3 in natural rubber (NR) was characterised by means of transport properties such as diffusion, sorption and permeability coefficients, swelling ratio, enthalpy, entropy and activation energy. Concentration of nano-CaCo 3 in NR was varied from 0 to 20 parts per one hundred parts of rubber by weight (phr). Transport process of toluene by use of equilibrium weight swelling of the NR and nanofilled composites have been studied in details. The effects of nanofiller concentration and temperature on transport of toluene through nano-CaCO 3 filled NR vulcanisates were studied. The microstructure of the nanocomposites was investigated by scanning electron microscopy. The diffusivity data of the systems have shown the dependence on the temperature and microstructure of nanocomposite. Generally, the concentration of nano-CaCO 3 plays an important role in transport process.

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Studies on molecular transport of n‐alkanes through poly(tetrafluoroethylene‐co‐propylene) elastomeric membrane

Kulkarni

Kittur

2006

J of Applied Polymer Sci

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Molecular transport of a series of n-alkanes through commercial TFE elastomer (FA 150L) has been studied in the temperature range 30 -50°C using sorption-gravimetric method. The Fickian diffusion equation was used to calculate the diffusion coefficients, which were dependent on the size of the alkanes and temperature. The diffusion coefficients at 30°C varied from 4.53 ϫ 10 Ϫ8 cm 2 /s (n-heptane) to 0.18 ϫ 10 Ϫ8 cm 2 /s (n-hexadecane). The liquid concentration profiles have also been computed using analytical solution of Fick's equation with the appropriate initial and boundary conditions and these were presented as a function of penetration depth of molecular migration and time of immersion. These results have been discussed in terms of molecular size of alkanes as well as temperature. In all the liquid penetrants, the transport phenomenon was found to follow the anomalous behavior. From the temperature dependence of diffusion and permeation coefficients, the Arrhenius activation parameters have been estimated. These parameters do not exhibit any systematic variation with the size of the penetrants. The resulting low diffusion coefficients, contribute to the superior barrier performance of the membrane, is due, in part, to the high glass transition temperature of Aflas TFE elastomer.

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Sorption and diffusion of organic vapors in two fluoroelastomers

Cited by 13 publications

References 14 publications

Permeation, diffusion, and sorption of dimethyl ether in fluoroelastomers

Permeation, diffusion, and sorption of dimethyl ether in fluoroelastomers

Evaluation of microstructure of natural rubber/nano-calcium carbonate nanocomposites by solvent transport properties

Studies on molecular transport of n‐alkanes through poly(tetrafluoroethylene‐co‐propylene) elastomeric membrane

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