SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF BOLAAMPHIPHILES FROM DIMERIC ACID

The physicochemical behaviour of bolaamphiphile derivatives with an an ionic, a cationic, or a non-ionic polar group and their mixtures is st udied mainly by surface tension measurements, quasi-elastic light-scat tering studies,H-1 NMR spectroscopy, and surface monolayers. Bolaamphi philes are synthesized by classical methods from a non-expensive mixtu re of alpha,omega-dicarboxylic acids, obtained by thermal Diels-Alder type cyclization of methyl 10-E,12-E linoleate, obtained from tall oil . The anionic and cationic bolaamphiphiles synthesized are water solub le and form stable monolayers when they are compressed. The anionic an d the cationic bolaamphiphiles with an iodide atom as counter-anion sh ow a behaviour between liquid-condensed and liquid-expanded. The other synthesized cationic bolaamphiphiles and the (1: 1) mixtures of anion ic-cationic bolaamphiphiles behave as liquid-condensed.