Abstract
We have studied the behaviors of a poly(methyl methacrylate) (PMMA) chains anchored to polystyrene particles at air/water and oil/water interfaces to recognize the roles of oil molecules in the PMMA property at the interfaces. Through the comparison of π-A isotherms we found two aspects of unique structural and rheological characteristics observed in PMMA-grafted polystyrene latex (PSL-PMMA) monolayer system in common. (1) The π-A isotherms showed surface pressure increase at larger occupied area compared to the PSL-PMMA size in solution at three different types of interfaces in most cases. (2) Compressional modulus, C s −1, obtained by π-A isotherm analysis for PSL-PMMA at interfaces, showed the tendency to decrease with molecular weight of PMMA. This is opposite to that of PMMA homopolymer at interfaces. The effect of oil molecules on PSL-PMMA system at interfaces are found both in the difference of occupied area and C s −1. The occupied areas were larger for the isotherms at the oil/water interfaces than those at the air/water interface in most cases, which suggested the reduced attractive interactions between anchored polymers by oil molecules. On the other hand, C s −1 of PMMA monolayers is strongly dependent on the constituents of the interface and the order of C s −1 is air/water > decane/water > dibutyl ether/water interfaces. The difference between oil species was not explained only by PMMA/oil interaction in bulk, but we suggested that interfacial tension of oil/water interface affects the miscibility of oil molecules with PMMA to cause higher miscibility between PMMA and dibutyl ether at the oil/water interfaces.
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Acknowledgments
This work was financially supported by JSPS KAKENHI Grant Numbers 19750099, 24850015. E.M. deeply appreciates the discussion with Prof. Hiroshi Maeda (Professor emeritus, Kyushu University).
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Mouri, E., Sakamori, H., Yoshinaga, K. et al. Behavior of polymer chains grafted from latex particles at soft interfaces. Colloid Polym Sci 292, 547–555 (2014). https://doi.org/10.1007/s00396-013-3097-4
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DOI: https://doi.org/10.1007/s00396-013-3097-4