Langmuir monolayers of non-ionic polymers: equilibrium or metastability? Case study of PEO and its PPO-PEO diblock copolymers

Journal of Colloid and Interface Science
Louise DeschênesJohannes Lyklema

Abstract

Stability and reorganization in Langmuir films of PEO in PEO homopolymers and PPO-PEO block copolymers were investigated using film balance measurements. The apparent fractional losses of EO segments transferred into the subphase resulting from successive compression-expansion cycles have been estimated. The apparent loss is mainly Γ(max), M(n) and time-dependent. At surface concentrations Γ⩽0.32 mg/m(2), PEO films are in equilibrium. For 0.32⩽Γ⩽0.7 mg/m(2), the losses remain modest. Further compression leads to densification of the monolayer, requiring the interplay of thermodynamics and kinetic factors In the plateau regime, the loss is higher and constant for 1⩽Γ(max)⩽2 mg/m(2) upon maintaining the achieved surface area for 15 min. Similar losses were obtained for PEO homopolymers of high Mn and PPO353-PEO2295. It suggests that the PEO remains anchored in a metastable state at the air-water interface at surface concentration well above the onset of the plateau. Additional losses are incurred for PEO homopolymers for monolayers kept compressed in the plateau for 2 h. For the interpretation of these phenomena a combination of elements from self-consistent field theory and scaling is desirable with as a trend an increasing cont...Continue Reading

References

Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·B Rippner BlomqvistP M Claesson
Oct 18, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Thomas J JoncherayRandolph S Duran
Apr 16, 2009·The Journal of Physical Chemistry. B·Chun-Lai RenI Szleifer
Jun 18, 2009·The Journal of Chemical Physics·S Srivastava, J K Basu
Jul 24, 2012·Journal of Colloid and Interface Science·Satoaki Kato, Masami Kawaguchi
Dec 10, 2014·Advances in Colloid and Interface Science·Louise DeschênesFrançois Saint-Germain

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Citations

Nov 20, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Da ShiMarie Pierre Krafft
Jul 21, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Ferhat HarounSophie Cantin

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