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Study on Raft Agent Assisted Graft Copolymerization of Methyl Acrylate onto Chitosan and RAFT Polymerization of Methyl Methacrylate

Author: ZhangYaQin
Tutor: DengKuiLin
School: Hebei University
Course: Polymer Chemistry and Physics
Keywords: RAFT polymeization Graft copolymerization Chitosan amphiphilic copolymer
CLC: O631
Type: Master's thesis
Year: 2007
Downloads: 36
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Abstract


The study on a dithiocarbonate group-assisted graft copolymerization of methyl acrylate onto chitosan with high graft efficiency and the reversible addition-fragmentation chain transfer polymerization (RAFT) of methyl methacrylate is performed in this paper and discussed in three sections, respectively.ChapterⅠ:Character, mechanism and research development of RAFT polymerization were presented in detail. The research development of grafted chitosan was also mentioned simply in this chapter.ChapterⅡ:Under assistance of the efficient transfer-reaction between the dithiocarbonate group and radicals in RAFT polymerization, the graft copolymerization of methyl acrylate (MA) onto chitosan with high grafting efficiency was performed. The effects of polymerization conditions, such as initiator concentration, monomer concentration, reaction time and temperature, on grafting parameters were studied. The graft copolymer was confirmed by a series of characteristic techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The experimental results have shown that the introduction of the dithiocarbonate groups onto chitosan has efficiently increased the graft efficiency, via minimizing the formation of homo-polymers in graft copolymerization.ChaperⅢ:Benzyl N, N-diphenylaminodithiocarbonate and N-hydroxyethyl acrylamide were synthesized and their structures were confirmed by Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance spectroscopy (NMR) as characteristic techniques. In the presence of N, N-diphenylaminodithiocarbonate, a series of PMMA with different reaction time was prepared initiated by azobisisbutyronitrile (AIBN) and the relationship between reaction time and ln[M]o/[M]t was discussed. The result revealed that the variation of the ln([M]o/[M]t) versus polymerization time shows a linear first-order kinetic characteristic, which illuminates that N,N-diphenylaminodithiocarbonate is an effective RAFT agent and as another normally evidence, PMMA-b-p(N-hydroxyethyl acrylamide) was also synthesized using PMMA as RAFT agent without addition of AIBN. FTIR spectrum of the copolymer further confirmed that N-hydroxyethyl acrylamide was blocked onto PMMA chains.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers
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