Styrene butadiene rubber (SBR) was efficiently cured (crosslinked) by using sulfur to accelerator ratio less than unity. This cured SBR was further compounded with carbon black filler (grade N330) with three different doses i.e., 5, 10, and 20 wt % of filler to form three different filled and crosslinked membranes, i.e., SBR5, SBR10, and SBR20. These filled rubber membranes and one unfilled but efficiently cured membrane, i.e. SBR0, were used for pervaporative removal of pyridine from its mixtures with water.The filled membranes were found to show better selectivity and mechanical properties but lower flux than the unfilled membrane. All of these membranes showed reasonably good range of flux and pyridine selectivity.

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Various blends of polypropylene and ethylene propylene diene terpolymer were prepared. In these blends, rubber phases were compounded with an optimum sulfur curing system. The equivalent cure time and state of cure of the mixes were studied in the temperature range from 120 to 190°C by a rheometer. The temperature‐independent parameters (E1, E2, S1, and S2) and specification of the temperature dependence curing rate constant (k) and induction period (t0) were determined. The activation energies of the crosslinking reaction are almost similar for the virgin EPDM and EPDM/PP mixes. The value 9 Kcal/mol was considered sufficiently accurate for these mixes. A discussion of temperature‐conversion factor of the mixes is also provided. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1231–1236, 1997

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