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Interpenetrating polymer networks (IPNs) of glycerol modified castor oil polyurethane (GC-PU) and poly[2-hydroxyethylmethacrylate] (PHEMA) were synthesized using benzoyl peroxide as initiator and N,N-methylene bis acrylamide as crosslinker. GC-PU/PHEMA interpenetrating polymer networks were obtained by transfer moulding. These were characterized with respect to their resistance to chemical reagents and mechanical properties such as tensile strength, per cent elongation and shore A hardness. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were undertaken for thermal characterization. The changes in NCO/OH ratio and GC-PU/PHEMA composition on the properties of the IPNs were studied. Keywords. Transesterification; glycerol modified castor oil polyurethane; poly[2-hydroxyethyl methacrylate].

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ABSTRACT:Interpenetrating polymer networks (IPNs) of glycerol modified castor oil polyurethane (GC-PU) and poly(2-ethoxyethyl methacrylate) poly(2-EOEMA) were synthesized using benzoyl peroxide as initiator and ethylene glycol dimethacrylate (EGDM) as crosslinker. GC-PU/poly (2-EOEMA) interpenetrating polymer networks were obtained by transfer molding. The novel GC-PU/poly (2-EO-EMA) IPNs are found to be tough films. These IPNs are characterized in terms of their resistance to chemical reagents thermal behavior (DSC, TGA) and mechanical behavior, including tensile strength, Young's modulus, shore A hardness, and elongation. The morphological behavior was studied by scanning electron microscopy.