As can be seen, the increase in the agar content in the blend films caused a decrease in the intensity of the band arising from the NH bending (amide II) at 1560 cm-1 of chitosan. This was coupled with a similar decrease in the absorbance band at 141 1cm-1and an increase of band absorbance at 1380 cm-1. Furthermore, the spectra of blend films show the disappearance of the intensive band at 1033 cm-1 that was obviously observed in the pure chitosan film and chitosan/agar blend containing agar content of 10%. This is due to the fact that when two or more polymers are mixed, changes in characteristic peaks occur as a reflection of the physical and chemical interactions [41,42]. These observations indícate the existence of good miscibility between chitosan and agar that is most likely caused by the formation of intermolecular hydrogen bonds between the amino and hydroxyl groups in chitosan and the hydroxyl groups in agar.