Interpolymer complexes based on N-isopropylacrylamide copolymers and polyacrylic acid

R. K. Rakhmetullayeva, G. A. Mun, E. M. Shaikhutdinov, U. Nakan, Zh. K. Bagitova


Interpolymer complexes based on N-isopropylacrylamide and 2-hydroxyethylacrylate copolymers (NIPAAm-co-HEA) and polyacrylic acid were investigated by turbidimetric method. The influence of the molecular mass of polyacid, the copolymer composition and the ionic strength of the solution on the critical pH of complexformation was shown. Phase transition behavior of interpolymer complexes in aqueous solutions based on poly(NIPAAm-co-HEA) (for three different compositions) and PAA was investigated. It was revealed that the temperature at which phase transition occurs was dependent on the initial monomer mixture of poly(NIPAAm-co-HEA) and the composition of interpolymer complexes.


N-isopropylacrylamide (NIPAAm); interpolymer complexes; thermosensitive copolymer; 2-hydroxyethylacrylate (HEA); polyacrylic acid

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Shild H.G. Poly(N-isopropylacrylamide): experiment, theory and application // Prog. Polym. Sci.. ─ 1992. ─ Vol.17. ─ P. 163-249.

Okano T. Molecular design of temperature-responsive polymers as intelligent materials // Adv. Polym.Sci.: Responsive Gels: Volume Transition I. Springer-Verlag. ─ 1993. ─ Vol.109. ─ P. 179-197.

Kujawa P. and Winnik F.M. Volumetric studies of aqueous polymer solutions using pressure perturbation calorimetry: a new look at the temperature-induced phase transition of poly(N-isopropylacrylamide) in water and D2O // Macromolecules. ─ 2001. ─ Vol.43. ─ P. 4130-4135.

Zareie H.M., Kim J.D. Investigation of stimuli-responsive copolymer by atomic force microscopy // Polymer. ─ 2000. ─ Vol.41. ─ P. 6723-6727.

Hirokawa Y., Rasdug T.I. Direct observation of internal structures in poly(N-isopropylacrylamide) chemical gels // Macromolecules. ─ 1999. ─ Vol.32. ─ P. 7093-7099.

Mun G.A., Khutoryanskiy V.V., Nurkeeva Z.S., Urkimbaeva P.I.. Intermacromolecular complexes and Related Composite Materials. ─ Almaty: Kazakh university, 2008. ─ 116 p. (in Russian).