Polystyrene foam (PS foam) both without and with 1% benzoyl peroxide coating
was found to be exponentially degraded within 6 months under the open-air and
arti ficial weathering exposure. The reaction mechanism for this foam was identi fied as chain scission. The peroxide was effectively used as photoaccelerator. The experimen-tal data and also the statistical hypotheses analysis using t-test with a 95% degree of confidence suggested that the data obtained from the open-air and those from artificial weathering exposure were analogous.
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