Abstract
Surface energetics of two fluorinated maleimide copolymers containing fluorinated side chain, i.e., poly(ethene-alt-N-(4-(perfluoroheptylcarbonyl)aminobutyl)maleimide) (ETMF) and poly(octadecene-alt-N-(4-(perfluoroheptylcarbonyl)aminobutyl)maleimide) (ODMF), are studied by contact angle measurements with 10 liquids consisting of fairly bulky molecules. Because of the inertness of octamethylcyclotetrasiloxane (OMCTS) and decamethylcyclopentasiloxane (DMCPS) molecules, their contact angles are used to determine the surface tension of the two polymers. It is found that other liquids show specific interactions with the ETMF films, and their contact angles deviate from a smooth curve that represents the surface tension of ETMF, i.e., 11.00 mJ/m2. On ODMF surfaces, only OMCTS and DMCPS yield useful contact angles. Other liquids either dissolve the polymer film or show a slip-stick pattern. This finding is discussed in terms of interactions between segments of the polymer chains and the test liquids. OMCTS and DMCPS are suggested as the appropriate probe liquids, meeting specific criteria necessary for the determination of accurate surface tension of fluoropolymers.
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This work was supported by the Natural Science and Engineering Research Council (NSERC) of Canada under grant no. 8278, University of Toronto Fellowship (H.T), and Ontario Graduate Scholarship (H.T).
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Tavana, H., Appelhans, D., Zhuang, RC. et al. Determination of accurate surface tensions of maleimide copolymers containing fluorinated side chain from contact angle measurements. Colloid Polym Sci 284, 497–505 (2006). https://doi.org/10.1007/s00396-005-1410-6
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DOI: https://doi.org/10.1007/s00396-005-1410-6