Applied Polymer Composites
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Title: DIFFUSION AND TRANSPORT BEHAVIORS OF ALIPHATIC PROBE MOLECULES THROUGH UNTREATED AND TREATED METAKAOLIN FILLED NATURAL RUBBER COMPOSITES
Page Range: p.247-266
Author(s): Rohini Thimmaiah S; Siddaramaiah
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Journal: Applied Polymer Composites
Issue Year: apc
Issue No: No.4
Molecular transport of a series of aliphatic probe molecules (hexane, heptane and decane) through untreated and silane treated metakaolin (MK) filled cured natural rubber (NR) composite membranes has been studied in the temperature range 25-60 deg C using the sorption-gravimetric method. The coefficients of sorption (S), diffusion (D), and permeation (P) have been calculated for elastomeric membrane-aliphatic penetrant systems. Significant increases in the diffusion and permeation coefficients were observed with increase in the temperature of sorption experiments. In all of the elastomeric-probe molecule systems, the transport phenomenon was found to follow the non-Fickian mode of transport. From the temperature dependence of diffusion and permeation coefficients, the Arrhenius activation parameters, such as the activation energy for diffusion (ED) and permeation (EP) processes, have been estimated. Furthermore, the sorption results have been interpreted in terms of thermodynamic parameters such as change in enthalpy (eH) and change in entropy (HS). 27 Refs.