The visible range spectra of polyvinylchloride (PVC) degraded in vacuum in methylsalicylate, amylsalicylate and 2‐methoxy‐4‐allylphenol (eugenol) are reported. On the basis of the percentages of double bonds formed in PVC the following reactivity order was assigned to the solvents methylsalicylate > amylsalicylate > eugenol. A free radical mechanism is proposed for the solvent participation. The activation energy for the overall double bond formation in methylsalicylate in the temperature range 176–208°C was found to be 21±0.5 kcal/mole.
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Varma et al. (1974) studied this question.
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