Sorption, Diffusion, and Permeation of Chlorinated Hydrocarbon Vapors Through Natural Rubber, Epoxidized Natural Rubber, and Their Blends

Abstract

The study investigates the transport process of various chlorinated hydrocarbons through natural rubber (NR), epoxidized natural rubber (ENR), and their blends. The effect of structure and morphology of the membranes on the transport parameters has been investigated. Sorption coefficient is found to increase and the permeability coefficient shows the reverse trend with increasing epoxy content. As the mol% epoxidation increases, the polymeric network structure becomes more compact, which leads to a decrease in the diffusion coefficient, which ultimately results in a low permeation coefficient. The morphology of NR /ENR blends has been investigated by combining scanning electron microscopy with permeability measurements. The permeation coefficient is found to be minimum for the NR/ ENR 70/30 composition; a 50/50 composition shows the maximum. The heterogeneous morphology of 70/30 NR / ENR blend results in the low permeability coefficient, whereas the co-continuous nature of the 50/50 composition accounts for ORDER REPRINTS the maximum permeability. Permeability measurements provide the most useful information about the way morphology is changing with composition of the blends and about the composition corresponding to the maximum level of co-continuity of the two phases.

Diffusion and transport through nanocomposites of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) and their blends

“…Moreover, the study of diffusion, sorption and permeation of blend systems provides valuable information about the nature of blend [5][6][7][8][9][10]. The transport properties of various rubber/rubber, thermoplastic elastomers, interpenetrating networks and natural fibre and particulate filled blends and composites have been studied from this laboratory [11][12][13][14][15][16][17][18][19][20][21]. The diffusion process is a kinetic parameter depending on the free volume within the material, segmental mobility of polymer chains and the size of the penetrant molecule [22].…”

Biodegradable sodium alginate and lignosulphonic acid blends: characterization and swelling studies

“…Sorption experiments are conducted for SA and blends for water uptake. The sorption technique is a good tool for the crystalline characterization of polymer blends [7,8] . The analysis of the equilibrium sorption by a blend can provide information on polymer-polymer interactions and morphology of the system.…”