Correlations with and prediction of activation energies of gas permeation and diffusion in glassy polymers

Yampolskii, Yu. P.; Shishatskii, S. M.; Alentiev, A. Yu.; Loza, Κateryna

doi:10.1016/s0376-7388(98)00130-6

Cited by 65 publications

(46 citation statements)

References 14 publications

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“…where a and b are adjustable parameters, which can be obtained either for diffusion of ''different gases in a single polymer, or a single gas in several polymers'' [94][95][96]. Temperature dependence of our water absorption kinetics also exhibited compensation effect and yielded a = -23.9 ln(cm 2 s -1 ), b = 0.49(mol kJ -1 )ln (cm 2 s -1 ) (Fig.…”

Section: Compensation Effectmentioning

confidence: 88%

“…9). Abundant information about compensation effects for inert gases diffusion in polymers is available [88,[94][95][96][97][98][99]. Conversely, we located only a few published reports on water diffusion compensation effect in a series of polymers.…”

Section: Compensation Effectmentioning

confidence: 99%

“…Therefore, activation energy and pre-exponential factors having common dependence on bond number exhibit linear proportionality according to Yatsimirskii. The compensation effect was observed in molecular diffusion in general and small molecules diffusion in polymers in particular, which is the logarithm of pre-exponential factor D 0 and threshold energy E 0 linearly correlates [84,88,[94][95][96][97][98][99] …”

Section: Compensation Effectmentioning

confidence: 99%

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Kinetics of water vapor diffusion in resins

Krongauz

Bennett

Ling

2016

J Therm Anal Calorim

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The water vapor sorption and desorption kinetics were monitored in methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), bromobutyl, ethylenepropylene-butadiene monomer (EPDM) rubber, and butyl rubber at various temperatures by gravimetric method. Modified thermogravimetric analysis system was built and used. The geometry of the samples was approximating that of the infinite two-sided plane sheet of certain thickness. The coefficients of water vapor diffusion in polymers were deduced by comparing the experimentally monitored kinetics and kinetics computed using diffusion coefficients as adjustable parameters. The activation energies of water vapor diffusion in these polymers were deduced in the temperature range from 30 to 75°C. The activation energy of diffusion was 45.9 kJ mol -1 in bromobutyl rubber, 46.4 kJ mol -1 in butyl rubber, 60.3 kJ mol -1 in EPDM rubber, and 43.5 kJ mol -1 in MABS. Compensation effect was observed for water vapor diffusion in this series of polymers. Compensation effect parameters were determined to be, a = -23.9/ln(cm 2 s -1 ) and b = 0.49/(mol kJ -1 ) 9 ln(cm 2 s -1 ), in fair agreement with published data for water diffusion in polymers.

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Section: Compensation Effectmentioning

confidence: 88%

Section: Compensation Effectmentioning

confidence: 99%

Section: Compensation Effectmentioning

confidence: 99%

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Kinetics of water vapor diffusion in resins

Krongauz

Bennett

Ling

2016

J Therm Anal Calorim

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“…Thus, there seems to be a slight increase of E a with increasing sodium caseinate content. Other researchers reported activation energies of diffusion in glassy polymers in the same range (88,105) or a little lower (36). The values for E d for release of gas from the granules were significantly higher, around 70 kJ mol -1 (values obtained vary between 68 and 75 kJ mol -1 ).…”

Section: Dynamics Of Gas Release From Compressed Tabletsmentioning

confidence: 85%

Solubility and Diffusion of Nitrogen in Maltodextrin/Protein Tablets

Schoonman

Ubbink

Bisperink

et al. 2002

Biotechnology Progress

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The gas transport properties of compacted tablets consisting of an amorphous mixture of maltodextrin and sodium caseinate were studied by dissolving nitrogen gas in the tablets and then determining the gas release over time as a function of temperature and water activity. Gas was dissolved in the tablet matrix by heating the tablets under pressure, generally to temperatures above the glass transition temperature of the matrix, holding them at these conditions for a specified time and then rapidly cooling them while maintaining the external pressure. The solubility of nitrogen was found to be largely determined by the free volume of the matrix, which in turn can be influenced to some degree by thermal and pressure treatments during gas loading. At the levels of free volume studied, the dissolved nitrogen is densely packed in the free volume, the packing density being virtually independent of the externally applied pressure. Release of gas from the tablets at temperatures below the glass transition temperature is generally well described by Fickian diffusion. The effective diffusion coefficient of gas release is strongly dependent on the microstructure and porosity of the tablet matrix, and an approximate model describing the relationship between tablet structure and rate of gas release is formulated. The model is in semiquantitative agreement with the rates of gas diffusion obtained for tablets and dense granules. Owing to the structural heterogeneity and variability of the tablets and the history-dependent properties of the tablet matrix, the effective diffusion coefficients of gas release from the tablets showed a relatively large spread. The temperature dependence of diffusional release follows an Arrhenius relation below the glass transition temperature. This allows the prediction of the nitrogen retention in the tablets as function of time, temperature and pressure.

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“…Park and Paul [4] have proposed that β depends on the type of group k. Other models consider that the diffusivity and the energies of activation are a function of the fraction of free volume [7]. Yampolskii et al [8] have suggested a methodology of contribution of groups for the prediction of the permeability for polyimides and polynorbornenes, considering the increment characteristic of group by the following relation:…”

Section: Introductionmentioning

confidence: 99%