SynopsisChanges in transparency and color as well as GHCI values of hard PVC foils exposed to gamma radiation were investigated while using different amounts of the stabilizers ethylene glycol bis-8-aminocrotonate (I), calcium/zinc laurate + epoxy compounds (II), and magnesium/zinc stearate + sorbitol + epoxy compounds (III), and plasticizers dioctyl phthalate (DOP) (IV), dioctvl sebacate (V), propylene glycol polyadipate + octyl alcohol composition (VI), and diisotridecyl phthalate (VII).A strong synergistic effect was observed in systems containing both plasticizer and stabilizer. Best results were obtained for the I + I1 + IV, I + I1 + V, and I + I11 + V systems.
synopsisThe GACI values of PVC foils, cont.aining 18% of dioctylphthalate, irradiated with accelerated electrons were studied after addition of various amounts of the stabilizers: (I) ethylene glycol bis-@-aminocrotonate, (11) calcium/zinc laurate + epoxy compounds, (111) calcium/zinc stearate, (IV) dioctyltin bis(octylt.hioglycolate). The effect of stabilization turned out to be very good, especially when stabilizer I was used. In the case of soft PVC foils in contact with water, elution of hydrogen chloride occurs. This creates difficulties in preparing PVC foils sterilized radiatively for medical purposes, especially if the foils are expected to be in contact with water.
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