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Abstract
Mechanical properties and adhesive strength of two kinds of room temperature cured interpenetrating polymer networks (IPNs) based on castor oil polyurethane were studied. The first IPNs (IPNs-I) were synthesized from castor oil, toluene diisocyanate (TDI) and vinyl or acrylic monomer. The second IPNs (IPNs-II) were prepared from castor oil, TDI, unsaturated polyester and vinyl or acrylic monomer. For IPNs-I made from different monomers, both maximum tensile strength and maximum lap shear strength between rusted iron plates decreased in almost the same order as the decreasing order of T g of the vinyl or acrylic polymer. The apparent crosslink density and tensile strength of the IPNs increased with NCO/OH molar ratio. The lap shear strength of IPN-1 exhibited a maximum at 70–80% polyurethane (PU) content and increased with NCO/OH ratio up to 1.92. For IPNs-II, acrylonitrile seems to be the best monomer. Optimum properties occurred at a weight ratio of acrylonitrile/polyester of about 8, a molar ratio of NCO/OH about 1.9 and at 65% PU content.
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