SYNOPSISPolyesters were obtained from castor oil and dibasic acids for example, malonic, succinic, glutaric, adipic, suberic, and sebacic acids. These prepolyesters were characterized by infrared spectrometry, viscosimetric measurements, and molecular weight determinations ( GPC) .These prepolyesters were mixed with methyl methacrylate and were subsequently polymerized by free radical polymerization by benzoyl peroxide in the presence of the crosslinker ethylene glycol dimethacrylate. Polyester/poly (methyl methacrylate) -interpenetrating polymer networks, PPE /PMMA IPNs, were obtained as soft and opaque elastomers by the transfer molding technique. These IPNs were characterized by static mechanical properties, differential scanning calorimetry (DSC ), and thermogravimetry. 0 1993

SYNOPSISThe kinetics aspects of the formation of castor-oil-based polyurethane/poly (2-hydroxyethyl methacrylate) interpenetrating polymer networks ( IPNs) were studied. The effect of parameters such as the polyurethane content, the activator, and acrylic cross-linker on the kinetics of formation of IPN networks was examined at room temperature. The formation of the individual networks, polyurethane, poly (2-hydroxethyl methacrylate), and their IPNs, was studied by measuring the decrease of absorbance of characteristic absorption peak of each system using IR spectroscopy.

Infrared spectroscopy was used to follow the kinetics of formation of castor-oil-based polyurethane/poly(methyl methacrylate) interpenetrating polymer networks (PU/PMMA IPNs) at room temperature. The synthesis of the individual networks, PU, PMMA and IPNs was studied by measuring the decrease of characteristic absorption peaks of each system.

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