Improving moisture proof of PET by blending with PEN for soya bean oil packaging

摘要

The improvement of the moisture barrier properties of PET via blending with PEN was studied. The microstructure of the bottle parisons and bottles were examined with scanning electron microscope (SEM). The transesterification reaction during PET/PEN injection molding and blow molding were confirmed by 1H-NMR. Water vapor permeability of PET bottle and PET/PEN blends bottle was determined. Water and volatile matter concentration and acid value were determined during store of soya bean oil: without any package; packed in the PET bottles; and PET/PEN blends bottles under 24±2°C and RH80% condition to compare the difference between PET and PET/PEN blends bottles. The result indicated that the transesterification reaction happening during PET/PEN blends injection and blow molding improved compatibility of PET and PEN. The microstructure of PET/PEN blends was continuous and compact. It means that the PET/PEN blends bottle had better moisture barrier properties. The result showed that for soya bean oil packaging the moisture barrier ability of PET/PEN blends bottle was increased 77.4% comparing with PET bottle.