Resistance of barrier elastomers to hazardous organic liquids

Abstract

SYNOPSISSorption and transport of several hazardous, organic chemicals into elastomer membranes have been studied using a simple gravimetric method. The Fickian model was used to estimate the diffusion coefficients of the polymer-solvent systems. The Joshi-Astarita model was employed to investigate the concentration-dependence of diffusion coefficients. From a study of the temperature dependence of the transport coefficients, activation parameters for the process of sorption, diffusion, and permeation have been estimated. Furthermore, the sorption results have also been interpreted in terms of the semiquantitative estimates of the kinetic rate constants and other thermodynamic parameters (enthalpy and entropy) of interest.

Volume II: near-field and altered-zone environment report

“…The kinetics of equilibrium concentration can be explained by the first-order kinetic rate equation. In addition, most polymer/solvent systems follow Fickian diffusion (Khinnavar and Aminabhavi, 1992).…”

“…plasticizers 10wer the glass transition temperature of a material making processing easier and the polymers more flexible. Phtalic esters are common plasticizers (Market al, 1985;Khinnavar and Aminabhavi, 1992).…”

Morphology, mechanical, bound rubber, swelling, and dynamic mechanical studies of chlorobutyl elastomer nanocomposites: effect of multiwalled carbon nanotube and solvent

“…The adsorption of polymer molecules onto the filler surface leads to two phenomena, which are the formation of BdR and a rubber shell on the filler surface. Many studies have been carried out on the mechanisms and factors affecting the formation of BdR [20][21][22][23][24][25]. The physicochemical characteristics of the filler surface and filler morphology have a profound effect on the BdR content in a compound.…”

“…The diffusion coefficients determined with the general theory agreed well with the results achieved by using more complicated calculations. The diffusion and sorption of organic liquids through polymer membranes have also been studied [21]. The absorption and desorption of organic fluids in both amorphous and crystalline poly(aryl-ether-ether-ketone) were investigated [22].…”

Correlation analysis of diffusion of organic solvents across synthetic low-polar polymeric membranes

“…However, the problem of quantitative evaluation of the effects of physicochemical characteristics of a penetrating liquid on its diffusion coefficient, even though being a subject of extensive studies, has not been satisfactorily solved as yet [133]. Khinnavar et al [3] analyzed the transport of esters across ethylene3propylene membranes using the relationship…”