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Thermo-oxidative aging of high-impact polystyrene sheets at 100°C was followed for a period of 1300 h. Four different types of samples were used, viz., virgin and recycled once, three, and five times. The samples exhibited systemic changes as a result of discoloration. The DTA of those samples indicates a rapid deterioration in thermal stability as well as deterioration in the optical properties.
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Salman et al. (1989) studied this question.
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