This result is similar to the one reported by Qu, Goa, Wu, and Zhang (2010) when cellulose nanofibrils was used to reinforce PLA. The peak at 1757 cm−1 which is corresponding to C O become broader, when the percentage of MCC added increased. According to Qu, Goa, Wu, and Zhang (2010) this was attributed to the interaction between C O from PLA and the O H groups from MCC. It is inter- esting to note that, the relatively small peaks between 3200 and 3400 cm−1 (O H bond stretching deformation of PLA) disappeared in PLA/MCC composites. The peak shifted to a broad peak approx- imately at 3350 cm−1 and increased intensity as the percentage of MCC was increased. The similar finding has been reported earlier by Yew, Mohd Yusof, Mohd Ishak, and Ishiaku (2005), when PLA matrix was filled with rice starch.