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- W4311376657 abstract "BAB amphiphilic triblock copolymers comprising poly(methoxyethyl acrylate) (PMEA) B blocks of variable degrees of polymerization (x = 50, 100, or 200) and a central poly(dimethyl acrylamide) (PDMAc) hydrophilic A block with a degree of polymerization y = 400 were synthesized by reversible addition fragmentation chain transfer polymerization, and their self-assembly in water was studied by light scattering and rheology. The BAB triblocks form a transient network in aqueous solution consisting of hydrophobic B cores bridged by hydrophilic A blocks. The exchange of B blocks is fast at low temperature (10 °C) and/or low x values because PMEA is not too hydrophobic. However, the PMEA blocks become more hydrophobic with increasing temperature, leading to a decrease of the exchange rate of the B blocks and to tunable thermo-thickening properties, opposite to the classical Arrhenius behavior. In contrast to many thermosensitive BAB triblocks that undergo an abrupt sol–gel transition above the critical solubility temperature of the B blocks, the hydrophobicity of PMEA gradually increases with T, leading to a progressive increase of the viscosity of the polymer dispersion. In addition, an unprecedented reorganization of the network was observed by rheology at a critical temperature, leading to a further decrease of the exchange rate of the B blocks that is not fully reversible. These features were attributed to the progressive variation of the hydrophobic character and hydration of PMEA with temperature." @default.
- W4311376657 created "2022-12-25" @default.
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- W4311376657 creator A5034930573 @default.
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- W4311376657 date "2022-12-01" @default.
- W4311376657 modified "2023-10-17" @default.
- W4311376657 title "Thermosensitive Hydrogels of BAB Triblock Copolymers Exhibiting Gradually Slower Exchange Dynamics and an Unexpected Critical Reorganization Temperature Upon Heating" @default.
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- W4311376657 doi "https://doi.org/10.1021/acs.macromol.2c01573" @default.
- W4311376657 hasPublicationYear "2022" @default.
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