ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
An investigation has been made of the sorption and permeation of benzene vapor in polymethyl acrylate and polyethyl acrylate over relatively wide ranges of temperature and concentration. The mutual diffusion coefficients were estimated from the rates of absorption and desorption, and the steady-state permeability. The diffusion coefficients determined by the different methods agreed within experimental error, suggesting that the sorption processes for these systems are controlled by truly Fickian diffusion mechanism. By using the equations of Frisch, the time lags for permeation have been calculated as a function of concentration from the diffusion coefficient data, and compared with the observed values. The calculated values agreed with the observed ones, indicating that the nonstationary state of permeation is controlled by a purely Fickian diffusion mechanism. Experimental data for the thermodynamic diffusion coefficients DT of benzene in PMA and PEA have been analyzed in terms of a simple free volume theory previously developed. It is found that, in all cases examined, the derived relation fits well experimental data. Three temperature-dependent parameters involved in the theory are evaluated, and their variation with temperature are discussed.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1963.100010530
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