Asymmetric, gradient-like block-copolymers: solution behaviour as a function of pH
Gradient copolymers, whose composition varies continuously as a function of chain length, are an intriguing class of materials whose synthesis needs particular care. For this reason alternative 'gradient-like' copolymers, with asymmetric structures intermediate between a gradient copolymer and a block-copolymer, are industrially valuable. They should mimic the behaviour of gradient copolymers, but are easier to synthesize. We synthesized a library of copolymers based on acrylic acid and butyl acrylate monomers and characterized their self-assembling behaviour as a function of pH. Dynamic Light Scattering and cryo-TEM experiments prove that the hydrodynamic size and morphology of the self-assemblies change as a function of pH in a way which depends on the monomer distribution along the copolymer chain. A detailed investigation on the structural features of the self-assemblies and their evolution as a function of pH, only possible through neutron scattering, is needed in order to better understand the structure-properties relationship and thus inspire polymer design.
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LONETTI Barbara; Barbara Farias-Mancilla; GUERRERO SANCHEZ Carlos; HARRISSON Simon and PREVOST Sylvain. (2018). Asymmetric, gradient-like block-copolymers: solution behaviour as a function of pH. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1877
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