Synthesis and characterization of a brush-like copolymer of polylactide grafted onto chitosan.
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 degrees C. It was found that a greater lactide content in the feeding ratio results in a higher grafting percentage. FTIR spectrometry, (1)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.
Liu
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Y
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, PR China. yliu806@263.net
Tian
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F
Hu
K A
KA
D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry*; D048271:Chitosan; D019344:Lactic Acid / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D011091:Polyesters / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D012542:Scattering, Radiation; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D044366:Transition Temperature; D014965:X-Rays
D001672:Biocompatible Materials; D011091:Polyesters; D011108:Polymers; D002686:Chitin; D019344:Lactic Acid; C033616:poly(lactide); D048271:Chitosan