SynopsisCastor oil-a renewable resource-is abundantly grown in tropical countries. It is a triglyceride of glycerol and ricinoleic acid containing hydroxyl functionality. These hydroxyls were reacted with 4,4'-diphenyl methane diisocyanate to form prepolyurethanes with different NCO/OH ratios.The prepolyurethane was swollen in ethyl methacrylate monomer containing 1% ethylene glycol dimethacrylate as crosslinker by radical polymerization initiated with benzoyl peroxide. The polyurethane/poly (ethyl methacrylate) interpenetrating polymer networks (IPNs) PU/PEMA were obtained as tough films by casting into glass molds. These IPNs were characterized by their resistance to chemical reagents, optical properties ( % transmittance), thermogravimetric analysis and mechanical properties, dynamic storage modulus ( c') , loss modulus ( c"), and loss tangent (tan 6 ) by dynamic mechanothermal analysis, morphology by scanning electron microscopy, and dielectric properties ( u , c', c", and tan 6 ) a t different temperatures.

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Bases. -Compound (IVe) exhibits promising activity against bacteria and fungi comparable to that of standard drugs. -(SHAH*, T. B.; GUPTE, A.; PATEL, M. R.; CHAUDHARI, V. S.; PATEL, H.; PATEL, V. C.; Indian J. Chem., Sect. B: Org. Chem.