STABILIZATION OF POLYETHYLENE FILMS BY PHOTOCHEMICAL CROSS-LINKING IN THE PRESENCE OF SULFUR MONOCHLORIDE AND SULFURYL CHLORIDE

Thermal stability of LDPE films crosslinked photochemically in the presence of sulfur monochloride or sulfuryl chloride using Irganox 1076, Phenozane 23, FAU 13, Irganox B 225, Diaphen NN as antioxidants has been studied. Presence of an photoinitiator accelerates essentially the antioxidants consumption when exposing of films with UV-light. Forbed photoproducts provide the practically constant thermal stability of crosslinked samples during one year. When using sulfur monocholoride as a photoinitiator thermal stabiliof a film during crosslinking after decrease on the initial stage begins to increase. As a result one can obtain materials containing 80-90% of the gel fraction characterized by the induction time of the same order or by several fold exceeding the values for nonirradited samples.