Improve the gas barrier property of PET film with montmorillonite by in situ interlayer polymerization

We obtain the organical clay (OMMT) by processing the Na–MMT using a kind of interlayer agent which contains –COOH in its structure. The interlayer distance of OMMT is 2.47 nm which is larger than the Na–MMT (1.90 nm). We synthesize the PET/OMMT nanocomposite by in situ interlayer polymerization and then make the composite into film by bi-axis orientation. We find that the barrier property of PET/OMMT film is greatly better than pure PET film.