Pune -41 1 008, I n d i a and SABU THOMAS* SchZ of Chemical Sciences, MQhatma Gandhi Unwersity Priyadarshini Hills P.O., Kottayam, Kerala -686560, IndiaThe sorption and diffusion behavior of a series of aromatic solvents through blends of nitrile rubber (NEIR) and epoxidized natural rubber (ENR) have been studied in the temperature range of 28-70°C. The effect of blend ratio, penetrant size and temperature on the transport properties was investigated. The relationship between the diffusion behavior and the morphology of the system was examined. Different transport parameters such as diffusion coefficient, permeability coefficient and swelling ratio have been calculated. Experimental permeability coefficients were compared with various theoretical models. The van't Hoff relation was used to compute the thermodynamic parameters.
ABSTRACT:A new class of blend membranes from blends of nitrile rubber (NBR) and epoxidized natural rubber (ENR) has been prepared and their morphology, miscibility, mechanical, and viscoelastic properties have been studied. The ebonite method was used to study the blend morphology of the membranes. The morphology of the blends indicated a two-phase structure in which the minor phase is dispersed as domains in the major continuous phase. The performance of NBR/ENR blend membranes has been studied from the mechanical measurements. The viscoelastic behavior of the blends has been analyzed from the dynamic mechanical data. An attempt was made to relate the viscoelastic behavior with the morphology of the blends. Various composite models have been used to predict the experimental viscoelastic data. The area under the linear loss modulus curve was larger than that obtained by theoretical group contribution analysis. The homogeneity of the system was further evaluated by Cole-Cole analysis. Finally, a master curve for the modulus of the blend was generated by applying the time-temperature superposition principle.
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