Abstract

Tests were conducted measuring the changes in weight of aramid fiber reinforced epoxy matrix composites during exposure to humid air. Composites containing surface treated fibers and composites containing fibers without surface treatment were tested. In addition, for the purpose of comparison, the weight changes of glass fiber reinforced epoxy com posites and pure epoxy were measured. From the weight change data the values of the maximum moisture contents and diffusivities were determined. The effects of fiber surface treatment on the moisture absorption characteristics of the aramid fiber reinforced com posite were assessed. An expression was developed for estimating the transverse diffu sivities of composites from the known resin and fiber properties when fibers absorb a sig nificant amount of moisture.

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