Evaluation of the water absorption content effect on the dielectric properties and tensile strength of polymer composites
Water absorption tests were performed on unidirectional glass/polymer composite materials used in high voltage composite (nonceramic) insulators. The composites were based on E-glass fibers with polyester resin. The composites were exposed to distilled water at room temperature and their resistance to moisture absorption in terms of the rate of moisture absorption, maximum moisture content and apparent diffusivity was determined. In particular, the effects of specimen geometry (the edge effect) on moisture absorption by the composites were evaluated. It was found that changes in moisture content have a special effect on the mechanical and electrical properties of the composite material. The tensile test was conducted to determine the mechanical properties, breakdown voltage and the leakage current were measured to determine the electrical properties and scanning electron microscopy was used to observe the morphological property of Glass Fiber Reinforced Polymer (GFRP) samples. A reduction in both module and tensile strength was observed with water aging. Furthermore, Water absorbed by composite samples had a detrimental influence on the breakdown voltage and leakage current of composite specimens that could be an indicator of degradation.
Journal of Science and Technology Composite, Volume:6 Issue:2, 2019
300 - 309
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