Influence of structure of elastomers on their permeability to gases

Amerongen, G. J. Van

doi:10.1002/pol.1950.120050304

Cited by 297 publications

(123 citation statements)

References 16 publications

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“…This result is not very surprising since many au- thors [17][18][19] have found a correlation between the enthalpy of dissolution and the Lennard-Jones temperature T LJ , as follows:…”

Section: Equilibrium Concentrationmentioning

confidence: 57%

Water sorption in amorphous poly(ethylene terephthalate)

Launay

Thominette

Verdú

1999

J. Appl. Polym. Sci.

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ABSTRACT:The water sorption characteristics of poly(ethylene terephthalate) (PET) amorphous samples of 250 m thickness have been studied at various temperatures in a saturated atmosphere. Concerning diffusivity, one can distinguish the following two domains characterized by distinct values of the activation energy: E D Ϸ 36 kJ mol Ϫ1 at T Ͼ 100°C, and E D Ϸ 42 kJ mol Ϫ1 at T Ͻ 60°C, with a relatively wide (60 -100°C) intermediary domain linked to the glass transition of the polymer. The crystallization of this latter occurs in the time scale of diffusion above 80°C but doesn't change the Fickian character of sorption curves. The equilibrium concentration m ϱ is an increasing function of temperature, but the solubility coefficient S decreases sharply with this latter, with the apparent enthalpy of dissolution ⌬H s being of the order of Ϫ28 kJ mol Ϫ1at T Ͻ 80°C and Ϫ45 kJ mol Ϫ1 at T Ͼ 80°C. Density measurements in the wet and dry states suggest that water is almost entirely dissolved in the amorphous matrix at T Ͻ 80°C but forms partially a separated phase at T Ͼ 80°C. Microvoiding can be attributed to crystallization-induced demixing.

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“…This result is not very surprising since many au- thors [17][18][19] have found a correlation between the enthalpy of dissolution and the Lennard-Jones temperature T LJ , as follows:…”

Section: Equilibrium Concentrationmentioning

confidence: 57%

Water sorption in amorphous poly(ethylene terephthalate)

Launay

Thominette

Verdú

1999

J. Appl. Polym. Sci.

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“…This tendency for the activation energy of diffusion for the larger penetrants to approach an asymptotic value similar to that of the activation energy of viscous flow for the uncross-linked polymer had been noted (15). This asymptotic behavior is thought to represent a similarity between the mobilities of large penetrants and the primitive segmental mobility of the polymer that participates in viscous flow (19).…”

Section: Activated State Theorymentioning

confidence: 95%

Polymer Transport Properties

Koros

Burgess

Chen

2015

Encyclopedia of Polymer Science and Technology

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“…This activation energy also supports the notion that the rate is controlled by ETR instead of oxygen transport in the bulk electrolyte phase or through a polymer because signifi cantly lower activation energies are seen when the latter phenomena are controlling. [81][82][83][84][85][86] For example, the diffusion of water molecules through a bulk water phase in the polymer (polybutadiene) on steel is about 19.2 kJ/mol. 85 Ruggeri and Beck 34 calculated that the rate of diffusion through the tail was ten times that needed to support corrosion and more than ten times greater than the diffusion rate through many of the polymer coatings, which was supported by the observation of FFC, even when an O 2 impermeable metallic coating was used.…”

Section: Discussionmentioning

confidence: 99%