Abstract
Poly(vinyl chloride) (PVC) formulation for outdoor applications should include the best suitable UV stabilization system. Two main families of UV stabilizers for polymer matrices exist: ultraviolet absorbers (UVA) and hindered amine light stabilizers (HALS). The effects of one UVA, one HALS and the combination of both were investigated in a PVC plastisol by comparing the colorimetric profiles, mechanical and viscoelastic properties of different films after artificial photo-irradiation. The UVA acts immediately by absorbing the major part of UV radiation which limits film degradation. Conversely, the HALS has no effect on the UV stabilization of PVC at the early stage, indeed the combination of both UVA and HALS behaves like single UVA, but at long term the presence of HALS accentuates PVC degradation. The tested HALS, being a strong base, is probably deactivated by acid-base reaction with HCl and is not able anymore to inhibit the PVC oxidation; thus, it should be replaced by a non-basic HALS (NOR HALS).
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