Synthesis and characterization of a brush-like copolymer of polylactide grafted onto chitosan

摘要

A brush-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 deg C.It was found that a greater lactide content in the feeding ratio results in a higher grafting percentage.FTIR spectrometry,~H NMR,DSC scanning,and wide-angle X-ray scattering,respectively,are used to characterize these branch copolymers.A copolymer has a definite melting point when the molar feeding ratio of lactide to chitosan is more than 10:1,and the DELTAH of the copolymers increases with the feed ratio of lactide to chitosan in feeding.