the present invention describes polymer compositions that have enhanced properties as oxygen barriers , as well as manufacturing methods for such oxygen - scavenging polymers and devices composed of such oxygen - scavenging polymers . these oxygen - scavenging polymers offer several benefits over existing materials , including a reduced ability for oxygen and carbon dioxide to permeate the polymer , reduced foaming of beverages stored in containers composed of the polymers , improved moisture absorption , and increased anti - bacterial / anti - fungal properties .