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The heat resistance and the weatherability of polyvinylchloride (PVC) powders used for PVC coated steel sheet were studied by electron spin resonance (ESR). PVC powders on the market differed respectively in the amount of radical formation at 160°C, heat resistance and film weatherability.Washing the PVC powders in a methanol/water solution decreased the amount of radical and improved the heat resistance and the weatherability of the films. Washed PVC powders showed close correlation among the amount of radical, the heat resistance and film weatherability, but no correlation was found in the case of the unwashed PVC powders. The experimental results indicated that the radicals detected by ESR at 160°C were mainly due to impurities mixed in during PVC polymerization, and that some of the impurities showed a negative effect and others showed no effects on the heat resistance and the weatherability.

Evaluation of the heat resistance and the weatherability of polyvinylchloride by electron spin resonance.