Article Dans Une Revue Macromolecules Année : 2025

Structure and Dynamics of Self-Assembled Thermo-Associative PNIPAM–PDMA-PNIPAM Triblock Copolymers of High Molar Mass

Résumé

ABA triblock copolymers with thermosensitive poly(N-isopropylacrylamide) (PNIPAM) side blocks and high molar mass (>500 kg/mol) poly(N,N-dimethylacrylamide) (PDMA) central blocks were characterized in aqueous solution. Rheological studies revealed that using a large PDMA central block allows thermo-induced gelation at concentrations as low as 1 wt % and temperatures ranging from 28 to 38 °C in pure water, depending on PNIPAM concentration. Their temperature-induced self-assembly process was studied by static light scattering. In the dilute regime, the copolymers formed flower-like micelles. At higher concentrations, they formed 1D flower necklaces, which percolated when the semidilute regime was reached. This loose network structure gave rise to viscoelastic liquid behaviors at temperatures close to the sol–gel transition in the unentangled semidilute regime, with gradually increasing relaxation times as temperature was increased.

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hal-05316716 , version 1 (05-11-2025)

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Théo Merland, Laurie Despax, Mathias Destarac, Simon Harrisson, Lazhar Benyahia, et al.. Structure and Dynamics of Self-Assembled Thermo-Associative PNIPAM–PDMA-PNIPAM Triblock Copolymers of High Molar Mass. Macromolecules, 2025, ⟨10.1021/acs.macromol.5c02457⟩. ⟨hal-05316716⟩
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