Abstract
Comblike block copolymer having a polyimide backbone and poly(N,N-dimethylaminoethyl methacrylate) side chains, i.e., PI-g-PDMAEMA, was prepared through the “grafting from” method using (N,N-dimethylaminoethyl methacrylate) polymerization on a polyimide multicenter macroinitiator by atom transfer radical polymerization (ATRP) mechanism. Its molar mass characteristics were determined in chloroform solution using hydrodynamic methods. PI-g-PDMAEMA is a relatively loose molecular brush with the substitution degree z = 0.44. The behavior of PI-g-PDMAEMA in aqueous solutions at a concentration 0.015 g cm−3 was studied by light scattering within a pH interval from 2.1 to 12.4. The temperature dependences of light scattering intensity and hydrodynamic sizes of dissolved species were obtained. Synthesized copolymer shows clearly temperature and pH responsiveness. PI-g-PDMAEMA is thermo-sensitive at pH ≥ 8.9. The pH growth is accompanied by a decrease in the phase transition temperature and an increase in the width of the phase transition interval and hydrodynamic radii of the micellar aggregates and large loose aggregates.
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The financial support was given by the Russian Science Foundation (project no. 14-13-00231).
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Filippov, A.P., Belyaeva, E.V., Zakharova, N.V. et al. Double stimuli-responsive behavior of graft copolymer with polyimide backbone and poly(N,N-dimethylaminoethyl methacrylate) side chains. Colloid Polym Sci 293, 555–565 (2015). https://doi.org/10.1007/s00396-014-3441-3
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DOI: https://doi.org/10.1007/s00396-014-3441-3