Abstract
An intercrosslinked network of varying percentages of N,N′-bismaleimido-4,4′-disphenyl methane (BMI), vinyl ester oligomer (VEO) modified unsaturated polyester (UP) matrices have been developed. Vinyl ester oligomer was prepared by reacting commercially available epoxy resin GY 250 (Ciba-Geigy) and acrylic acid was used as toughening agent for unsaturated polyester resin. BMI-VEO-UP matrices were characterized for their mechanical properties, viz tensile strength, flexural strength and unntoched Izod impact test as per ASTM standards. The dielectric strength and water absorption measurements were also performed according to ASTM standards. Data obtained from mechanical studies, dielectric strength and water absorption indicate that the introduction of VEO into unsaturated polyester resin improves mechanical properties and affects the moisture resistance according to its percentage concentration. The incorporation of BMI into the VEO modified unsaturated polyester system improves mechanical properties, dielectric strength and resistance to moisture absorption according to its percentage concentration.
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