Abstract
Six kinds of inorganic, and nine kinds of organic lead compounds were studied as stabilizers against photodegradation of polyvinyl chloride (PVC). The molecular weight distribution (MWD) curves of outdoor exposed PVC containing various kinds of lead compounds were measured by using gel per meation chromatography (GPC). As a result MWD curves showed a good correlation between the average molecular weight and the change of surface appearance by outdoor exposition. Di-basic lead stearate and di-basic benzoate were found to be excellent stabilizers for PVC, both of which did not form any amount of gelled matter caused by the crosslinkage by photodegration. Generally, di-basic lead compounds showed a better stabilization of PVC than the normal lead compounds.
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