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A. Kamińska


The effect of UV irradiation on films made of PVC containing small amount of modifying copolymers


Polimery 1982, No 2, 59



DOI: dx.doi.org/10.14314/polimery.1982.059

Summary

The changes in physicochemical and mechanical properties caused by UV irradiation of a packaging film made of PVC with added copolymers of the type: VC-VAc, MBS and an acrylic resin (Paraloid) have been investigated. By evaluating the extent of changes insolubility, permeability and colourit has been demonstrated that the presence of these copolymers in the film contributes to an increase in the UV-sensitivity of PVC. It has also been found that crosslinking of PVC results in a decrease of permeability, ten sile strength and elongation at break of the film. The numerical values characterizing the two last-mentioned properties decrease rapidly after appearance of gel, whereas their maximum values are observed Just before its appearance. Thus, at crosslinking den sity of PVC below 1 the effect of crosslinking on these properties is positive and at crosslinking den sity above 1 — negative.


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