Abstract
The Langmuir film formation of poly(ethylene glycol) (PEG)- and poly(methacrylo polyhedral oligomeric silsesquioxane) P(MA-POSS)-based diblock copolymers (PEG5k-b-P(MA-POSS)x) at the air/water interface is investigated. While the Langmuir film formed by the PEG5k collapses at π ≈ 8 mN m−1, the PEG5k-b-P(MA-POSS)x forms a stable film on the water surface revealing various phase transitions in surface pressure vs mean molecular area (π-mmA) isotherm—manifested by various pseudo-plateaus during compression. At higher surface coverage, the π-mmA isotherm exhibits a phase transition that is attributed to the transformation of the P(MA-POSS) monolayer into a multilayer film that is confirmed by AFM measurements of the Langmuir-Blodgett films fabricated before and after the phase transition and direct infrared reflection absorption spectroscopy of the Langmuir film during compression. At a still higher surface pressure, another pseudo-plateau is observed that is assigned to the ultimate film collapse as verified by the Brewster angle microscopy.
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Acknowledgments
The AFM measurements were carried out within the cooperation of the SFB TRR 102 (project B03, Thomas Thurn-Albrecht).
Funding
HH received financial support from the Higher Commission (HEC) of Pakistan under NRPU project no. 20-3074/NRPU/R&D/HEC/13 and QAU URF. JK received financial support from the Deutsche Forschungsgemeinschaft (SFB TRR 102, project B07).
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Hasan, N., Ullah, A., Ullah, S. et al. Langmuir film formation of amphiphilic hybrid block copolymers based on poly(ethylene glycol) and poly(methacrylo polyhedral oligomeric silsesquioxane). Colloid Polym Sci 297, 1149–1159 (2019). https://doi.org/10.1007/s00396-019-04517-2
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DOI: https://doi.org/10.1007/s00396-019-04517-2