Chemical Modification Of Poly(Vinylacetylene) And Synthesis Of Poly(1,2,3-triazole)s

There are increasing reports on click chemistry since it was proposed by Sharpless et al in 2001,because it feathers with many excellent reaction properties such as quantitative yields,high tolerance of functional groups,and insensitivity of the reaction to solvents and so on.Since the first report of click chemistry in polymer science by Hawker and co-workers in 2004,the application of click chemistry is extended more broadly,and affects extensively the synthesis and modification of novel polymers.In this dissertation,copper-catalysized azide-alkyne 1,3-dipolar cycloaddition was used for chemical modification of PVacet and for synthesis of novel linear polymers to obtain a series of 1,2,3-triazole rings containing polymers in backbones or side-chains.The structures of these polymers were characterized by FT-IR,¹H NMR,¹³C NMR and ¹⁹F NMR.And their solubility,thermal and optical properties were investigated.In addition,related physical properties such as Mn,Mw, Mw/Mn and mophours were measured and discussed.The main researches include the following four parts.First,the important monomer TMSA was synthesized through two steps from original material,ethylene.And then,TMSA reacted with bromoethylene by Sonogashira coupling reaction to form TMSA.After polymerization of TMSA,unprotecting, PVacet was prepared.The organic azides were prepared by halgon or methylsulfone reacting with N_aN₃.Finally,PVacet was modified by organic azides through click reaction to yield modified polymers containing 1,2,3-triazole rings in side-chains of polymers.Secondly,bis(azidomethyl)benzene and aromatic bisalkynes were designed and synthesized.And then a series of novel poly(triazole)s were prepared by click cyclopolymerization between the monomers of bisazides and bisalkynes.Thirdly,novel bisazides containing ketone or sulfone groups were designed and synthesized,and then a series of novel poly(triazole)s were prepared by click cyclopolymerization with these bisazides and previous bisalkynes.Finally,novel bisazides containing PFCB were designed and synthesized,and then a series of novel poly(triazole)s were prepared by click cyclopolymerization with these bisazides and previous bisalkynes.