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Conformation mediated preferential swelling of amphiphilic block copolymer ultrathin films

Abstract : Steady-state and dynamic swelling characteristics of PEO-PPO-PEO copolymer ultrathin films comprising 2-layered structure, where the bottom layer (L1) is made of one PEO (hydrophilic)-PPO (hydrophobic) bilayer and the top layer (L2) is made of two alternating PEO-PPO bilayers, have been studied at room temperature in precisely controlled environment of 10–93% relative humidity (RH). Swelling, which is monitored by measuring the thickness of the films using X-ray reflectivity (XRR), is found to be largely dissimilar in differently thick films prepared by varying the concentration of mother solutions from 1 g/L to 4 g/L. This is well explained considering a preferential-swelling of amphiphilic block copolymer, where only the hydrophilic PEO blocks contribute in swelling and PPO acts a barrier in the diffusion of water molecules. The swelling kinetics is governed by the thickness/width and coverage of outer PPO block layer.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-01904918
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Soumis le : jeudi 25 octobre 2018 - 14:16:50
Dernière modification le : jeudi 12 mai 2022 - 16:10:07

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Jayanta Kumar Bal, Manabendra Mukherjee, Lucky Dildar, Alain Gibaud. Conformation mediated preferential swelling of amphiphilic block copolymer ultrathin films. Journal of Polymer Research, 2017, 24 (12), ⟨10.1007/s10965-017-1384-3⟩. ⟨hal-01904918⟩

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