ELASTOMERIC MODIFICATION OF AN IR CURED UNSATURATED POLYESTER RESIN TO IMPROVE MECHANICAL PROPERTIES

摘要

An elastomeric modification of the "core layer" in an Unsaturated Polyester Resin reinforced with two fiber glass chopped strand mats,was used to improve impact resistance.Stress-strain and rheological properties were also measured to evaluate overall performance.Prior to resin-modifier mixing,either cis-polybutadiene or 1,7 octadiene were prereacted(10 min.or 20 min.)with styrene.The reinforced three layer samples were cured in a medium wave IR oven.Results show that both modifiers impart a considerable increase in impact resistance,with a small decrease in Young's and storage moduli.