Abstract

Various commercially employed lubricants, such as low molecular weight polyethylene (Type PA-520 Wax), hydroxystearic acid (Loxiol G-21), butyl stearate (Loxiol G-32) and di-stearyl phthalate (Loxiol G-60), have been examined for their active rôle in the photo-oxidative degradation of poly(vinyl chloride) (PVC). The results show that low molecular weight polyethylene has an obvious accelerating effect on the photo-oxidative degradation of PVC, whereas other lubricants reduce the effect of photo-oxidation. None of the lubricants used has an obvious rôle in the chain scission and crosslinking of PVC.

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