Abstract
Graft copolymers with a polyimide backbone and poly(methyl methacrylate) side chains are investigated in dilute chloroform and ethyl acetate solutions via the methods of molecular hydrodynamics and optics. Copolymer samples are prepared through the “grafting from” method via atom-transfer radical polymerization with a multicenter polyimide macroinitiator. In solutions of copolymers with low degrees of functionalization Z (40%), supermolecular structures are formed as a result of interactions between the polyimide backbones. In samples with Z → 100%, the backbone is well screened by side chains; therefore, molecular solutions are formed in both solvents. The hydrodynamic and conformational behavior of samples with high functionalization degrees changes after the transition from ethyl acetate to chloroform owing to the different thermodynamic qualities of the solvents with respect to the copolymer components. In both solvents, the backbone tends to avoid contact with a poor solvent. This effect is more pronounced in the case of ethyl acetate. Macromolecules of the studied graft copolymers are characterized by high equilibrium rigidities (>40 nm) that are 10 times higher than the corresponding characteristics of aromatic polyimides.
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Original Russian Text © A.P. Filippov, E.V. Belyaeva, A.S. Krasova, M.A. Simonova, E.B. Tarabukina, T.K. Meleshko, D.M. Ilgach, N.N. Bogorad, A.V. Yakimansky, 2014, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2014, Vol. 56, No. 1, pp. 3–12.
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Filippov, A.P., Belyaeva, E.V., Krasova, A.S. et al. Synthesis and investigation of the solution behavior of graft block copolymers of polyimide and poly(methyl methacrylate). Polym. Sci. Ser. A 56, 1–9 (2014). https://doi.org/10.1134/S0965545X14010015
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DOI: https://doi.org/10.1134/S0965545X14010015