New fluorinated polysiloxanes containing an ester function in the spacer—II. Surface tension studies |
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Authors: | Emmanuel Beyou Bernard Bennetau Jacques Dunogus Pierre Babin Dominique Teyssi Sylvie Boileau Jean-Marc Corpart |
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Affiliation: | Emmanuel Beyou,Bernard Bennetau,Jacques Dunoguès,Pierre Babin,Dominique Teyssié,Sylvie Boileau,Jean-Marc Corpart |
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Abstract: | The surface tensions of fluorinated polysiloxanes prepared by hydrosilylation of unsaturated perfluoroalkyl esters derived from undecylenic acid CH2?CH? (CH2)8? COO? CH2? CH2? RF, with RF = C6F13, C8F17, and C8F17? (CH2)10COO? CH2? CH2? CH?CH2] by methylhydrodimethylsiloxane copolymers of various Si? H contents have been measured. The critical surface tensions, γc, and the solid surface tensions, γDs, were deduced from n-alkane and water contact angle data. They decrease as the perfluoroalkyl graft content of the copolymers increases. Some of them, which are in the range of the lowest surface tension fluoro polymers known, are observed when the fluorinated segments are self-organized at the interface, i.e. when the polymers are mesomorphous or crystalline at room temperature. |
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Keywords: | fluorinated polysiloxanes copolymers self-assembled monolayers surface tension contact angles liquid crystalline polymers transition temperatures |
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