Abrush-like poly(DL)-lactide grafted onto chitosan as the backbone was investigated. The graft copolymerization was
carried out with triethylaluminum as catalyst in toluene at 70 C. It was found that a greater lactide content in the feeding ratio
results in a higher grafting percentage. FTIR spectrometry, 1H NMR, DSC scanning, and wide-angle X-ray scattering, respectively,
are used to characterize these branch copolymers. Acopolymer has a definite melting point when the molar feeding ratio of lactide
to chitosan is more than 10:1, and the DH of the copolymers increases with the feed ratio of lactide to chitosan in feeding