237

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  • DOI
  • Date of creation in the UzSCI system15-07-2021
  • Read count237
  • Date of publication27-03-2021
  • Main LanguageIngliz
  • Pages62-69
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This article presents the results of the quaternary ammonium salt synthesis containing nitrogen heterocyclic fragments, including N, N-diallylbenzoimidazolyl bromide and N, N-diallylbenzotriazolyl bromide and their copolymerization with acrylic acid. The synthesis of allyl monomers - N, N-diallylbenzotriazolium bromide (DABTB) and N, N-diallylbenzoimidazolium bromide (DABIB) was carried out by reacting allyl bromide with benzotriazole and benzoimidazole at a temperature of 50-60 °C in an allylation reaction in an organic solvent. The obtained salts were recrystallized from ethyl alcohol. The substance is obtained in the form of colorless crystal, its yield is 80-85%. The purity of the obtained salt was checked by TLC. The radical polymerization of N, N-diallylbenzotriazolium bromide in aqueous solution in the presence of a radical initiator potassium persulfate at a temperature of 60-70 °C is in an inert nitrogen gas. The polymer yield is up to 40%. Binary copolymerization of the synthesized salt of N, N–diallybenzotriazolium bromide with acrylic acid was carried out. It was found that copolymerization does not occur in the absence of an initiator. Copolymerization was carried out in organic solvents in the presence of the radical initiator azobisisobutyronitrile. After the end of the copolymerization reaction, the reaction mixture was precipitated with benzene and dried to constant weight. Dried copolymers to constant weight were analyzed for the content of carboxyl groups by titration of the samples with 0.1 N KOH solution. The synthesized copolymers dissolve well in water, ethanol, acetone, but do not dissolve in toluene and benzene. The results obtained show that the composition of the copolymers depends on the initial ratio of the monomer mixture and the content of each monomer in the copolymer changes symbatically with its initial content. The structure of the synthesized monomers and (co) polymers has been proved by IR spectral studies. According to the IR spectral results, the spectrum of the synthesized copolymer is radically different from the spectra of the starting comonomers.

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