The effects of blend ratio, compatibilization and dynamic vulcanization on permeation of gases through HDPE/EVA blends

摘要

The effects of blend ratio, compatibilization and vulcanization on the permeability of O₂ and N₂ gas through HDPE/EVA blends were analyzed. As the volume fraction of EVA in the blend increases the permeability increases. The variation in permeability is correlated with the phase morphology. Oxygen exhibits a higher permeability than nitrogen because the “kinetic diameter” of N₂ is greater than that of O₂. The O₂/N₂ selectivity of HDPE is higher than that of EVA and as a result the selectivity decreases with increase in EVA content in the system. The O₂ and N₂ permeabilities decrease and O₂/N₂ selectivity increase upon compatibilization and dynamic vulcanization. The experimental gas permeabilities in HDPE/EVA blends are compared with several theoretical models of permeation.