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    Interfacial behavior of randomly charged sulfonated polystyrene (PSS) at the air/water interface

    Year: 2008

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volumes 313-314, 1 February 2008, Pages 660-665, 20111221

    Authors: Young-Soo Seo, Farhan Ahmad, Kwanwoo Shinc, Ju-Myung Song, Joon-Seop Kim, Miriam H. Rafailovich, Jon Sokolov and Sushil K. Satija

    Organizations: Department of Nano Science and Technology, Sejong University, Seoul 143-747, Republic of Korea, Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Seoul 121-742, Republic of Korea, Department of Polymer Science and Engineering, BK21 Education Center of Technology for Advanced Materials and Parts, Chosun University, Republic of Korea, Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY 11794, United States

    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.