Study of the physico-chemical properties of novel water-soluble copolymers of cationic type based on N-isopropylacrylamide

  • Adilet Alikulov al-Farabi Kazakh National University, Almaty
  • Grigoriy Mun al-Farabi Kazakh National University, Almaty
  • Asel Toktabayeva al-Farabi Kazakh National University, Almaty
  • Raikhan Rakhmetullaeva al-Farabi Kazakh National University, Almaty
  • Valentina Yu Kazakh-British Technical University, Almaty
  • Aigerim Mukhametkanova Kazakh-British Technical University, Almaty
  • Tulegen Seilkhanov Sh. Ualikhanov Kokshetau State University
Keywords: N-isopropylacrylamide,  N-(2-vinyloxyethyl)-N-(2-cyanoethyl)amine,  cationic copolymers, thermosensitivity.

Abstract

Novel water-soluble copolymers of cationic type have been synthesized by free-radical copolymerization of N-isopropylacrylamide (NIPAAm) and N-(2-vinyloxyethyl)-N-(2-cyanoethyl)amine (VOECEA) in ethanol solutions, employing 2,2’-azobisisobutyronitrile (AIBN) as radical initiator. The polymerization at 60°C was carried out in ampules in an argon atmosphere for 2 h. After the reaction, the resultant copolymers were precipitated twice in boiling water and was then
vacuum-dried for 24 h. The obtained NIPAAm-VOECEA copolymers were characterized by means of Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). It was observed that for copolymers with low moieties of NIPAAm in composition the degradation starts at low temperatures due to thermal decomposition of nitrogen groups of the copolymer. The presence of an oxygen in VOECEA backbone contributes the decomposition of linear copolymers at low temperatures. It was measured the glass transition temperature (Tg) of the synthesized copolymers. It was observed that with increasing the units of NIPAAm in copolymer composition the Tg increases due to the folding of linear polymer chain and the rigidity of NIPAAm moieties.

Author Biography

Tulegen Seilkhanov, Sh. Ualikhanov Kokshetau State University
Head of Laboratoru NMR spectroscopy

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Published
2016-03-30
How to Cite
Alikulov, A., Mun, G., Toktabayeva, A., Rakhmetullaeva, R., Yu, V., Mukhametkanova, A., & Seilkhanov, T. (2016). Study of the physico-chemical properties of novel water-soluble copolymers of cationic type based on N-isopropylacrylamide. Chemical Bulletin of Kazakh National University, (1), 18-24. https://doi.org/https://doi.org/10.15328/cb664
Section
Organic and Polymers Chemistry