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98455 CHEMICAL, THERMOCHEMICAL, AND MECHANICAL STUDIES OF FRP DEGRADATION IN CORROSIVE ENVIRONMENTS

Picture for 98455 CHEMICAL, THERMOCHEMICAL, AND MECHANICAL
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Product Number: 51300-98455-SG
ISBN: 98455 1998 CP
Author: L. Prian, A. Barkatt
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Extensive measurements on E-glass/vinylester rods exposed to air, water, and ammonia solutions at temperatures between 23°C and 80°C for 7 to 224 days, showed that integration of the chemical, the thermochemical, and mechanical data is necessary for developing useful models of FRP degradation. For instance, fiber dissolution is a major mechanism in basic environments while resin hydrolysis is most pronounced in acidic environments . Dramatic increases in degradation rates may be observed in some cases of environmental exposure after a certain induction period, even at relatively low temperature (below Tg). The degradation following an initial period during which the properties of the composite remain unaffected or even improve is due to hydrolytic depolymerization becoming the predominant mechanism once post curing has achieved its maximum extent. Applied mechanical stress was not observed to aggravate the effects of exposure to water at temperature of 60°C. Keywords: composite, fiber reinforced plastics, thermogravimetric analysis, differential scanning calorimetry, environmental degradation, depolymerization.
Extensive measurements on E-glass/vinylester rods exposed to air, water, and ammonia solutions at temperatures between 23°C and 80°C for 7 to 224 days, showed that integration of the chemical, the thermochemical, and mechanical data is necessary for developing useful models of FRP degradation. For instance, fiber dissolution is a major mechanism in basic environments while resin hydrolysis is most pronounced in acidic environments . Dramatic increases in degradation rates may be observed in some cases of environmental exposure after a certain induction period, even at relatively low temperature (below Tg). The degradation following an initial period during which the properties of the composite remain unaffected or even improve is due to hydrolytic depolymerization becoming the predominant mechanism once post curing has achieved its maximum extent. Applied mechanical stress was not observed to aggravate the effects of exposure to water at temperature of 60°C. Keywords: composite, fiber reinforced plastics, thermogravimetric analysis, differential scanning calorimetry, environmental degradation, depolymerization.
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