When the band intensities of the spectra of 10% and 20% w/w of CEO and CWO containing films were analysed and compared,it was hard to find any difference; this that little chemical interaction had taken place during the film preparation.However, the addition of more CEO (30% w/w) resulted in a marked increase in the intensity of the CH stretching peak at around 2870 cm−1, suggesting an increase in the content of ester groups, which might come from the CEO molecule.