EFFECT OF SLIP AND WAX ON OXYGEN TRANSMISSION RATES THROUGH STYRENEBUTADIENE COPOLYMER FILMS

摘要

A significant amount of testing has been performed on Styrene Butadiene Copolymer (SBC) films to establishproperties for different applications. Oxygen Transmission Rate (OTR) is a property that is important for freshcutproduce packaging. In monolayer films, this property can vary significantly from one sample to another.This study was conducted to try to determine the source of this variation.The study found that the microcrystalline wax added to some SBC’s to prevent pellet blocking also hindersoxygen transmission. It is theorized that the wax migrates to the surface of the film and reduces the rate atwhich gas molecules are adsorbed onto the film. The study also found that the use of an erucamide wax as aslip agent can counter-act the wax effect. A possible explanation for this is that the slip agent breaks up orreduces the amount of wax on the surface, by blooming to the surface itself.