Abstract
AbstractExpanded extruded polystyrene foam was exposed outdoors in air and floating in seawater. The degradation of the materials was determined by ultraviolet spectroscopy, gel permeation chromatography, and measurement of yellowness, viscosity, and tensile properties. The samples underwent extensive yellowing, reduction in average molecular weight, and embrittlement in the exposed surface layer. Furthermore, the rate of deterioration was shown to be faster in seawater than in air, possibly due to the removal by the seawater of the outer protective yellow‐colored layer formed during early exposure to sunlight.
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