White Spirit Permeation Resistance of Polyethylene,Polyethylene/Modified Polyamide,and Polyethylene/Blends of Modified Polyamide and Ethylene Vinyl Alcohol Bottles

摘要

The main objective of this study was to investigate the barrier properties of polyethylene (PE),PE/modified poly-amide (MPA),and PE/blends of modified polyamide and ethytene vinyl alcohol (MPAEVOH) bottles against white spirit permeation.After MPAEVOH barrier resins were blended with PE,the resistance of the PE/MPAEVOH bottles against white spirit permeation was significantly improved compared to the PE bottle.Surprisingly,with proper compositions of MPAEVOH resins,the white spirit permeation resistance of PE/MPAEVOH bottles at 40deg C improved by more than 3000 times compared to the PE bottle,wherein the best permeation resistance (4200 times barrier improvement) of the PE/MPAEVOH bottles was found as the weight ratio of MPA :EVOH reached 4:1.These interesting permeation properties of PE/MPAEVOH bottles were investigated in terms of the barrier and free-volume properties of the base resins and their corresponding morphologies in Mow-molded bottles.