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Transport Studies of Hydrogels Based on Natural Rubber and Polyethylene Oxide in Cationic Dye Solutions

Author Affiliations

  • 1School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills, Kottayam, 686560, Kerala, INDIA

Res. J. Recent Sci., Volume 3, Issue (ISC-2013), Pages 352-361, (2014)


Block copolymers (BCs) of varying compositions were prepared from hydroxyl terminated liquid natural rubber (HTNR) and polyethylene oxide (PEO) of various molecular weight.. The hydrophilic PEO enables these NR-b-PEO BCs to swell in water and in aqueous cationic dyes, viz., malachite green (MG), crystal violet (CV), safranineT (ST), methylene blue (MB) and bromocresol green (BCG). The diffusion and permeation coefficients of BCs increases with the PEO content. The swelling studies also point to the fact that the general order of interaction of the dyes with the BCs is MG > CV > ST > MB > BCG. The diffusional exponent value is Fickian in water and in dye solution for BC-1 and for the rest of the BCs it is of the anomalous type, with a bias towards the Fickian type. Hence it is inferred that the polymer relaxation rate is greater than the solvent diffusion rate in BC-1 during swelling whereas in the others, rate of polymer chain relaxation and the solvent diffusion rate are about the same order of magnitude.


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