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.
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, PR China. yliu806@263.net
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Liu
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Tian
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Hu
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