Interfacial behavior of randomly charged sulfonated polystyrene (PSS) at the air/water interface
Langmuir monolayers of randomly charged polystyrene sulfonated acid, PSSx, with various degrees of sulfonation (x) ranging from 4 up to 35% were studied. Three characteristic regimes of PSSx were determined, according to the balance between electrostatic and hydrophobic interactions in these ranges....
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Published in | Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 313-314; pp. 660 - 665 |
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Main Authors | , , , , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.02.2008
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Langmuir monolayers of randomly charged polystyrene sulfonated acid, PSSx, with various degrees of sulfonation (x) ranging from 4 up to 35% were studied. Three characteristic regimes of PSSx were determined, according to the balance between electrostatic and hydrophobic interactions in these ranges. Low charged PSS (4–5%) aggregates to irreversible films upon compression, leading to strong hysteresis. Moderately charged PSS (6–16%) is shown to less hysteretic. In contrast, highly charged PSS (35%) formed a reversible film due to dominant electrostatic interactions over hydrophobic interaction. Using in situ neutron reflectivity (NR) we observed that PSS with 35% sulfonation formed a highly stretched brush into the water subphase upon compression. |
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ISSN: | 0927-7757 1873-4359 |
DOI: | 10.1016/j.colsurfa.2007.04.095 |