REACTIVE SURFACTANTS IN HETEROPHASE POLYMERIZATION .10. CHARACTERIZATION OF THE SURFACE-ACTIVITY OF NEW POLYMERIZABLE SURFACTANTS DERIVED FROM MALEIC-ANHYDRIDE

Characterization of the surface activity of previously previously obta ined polymerizable dialkyl maleates is performed to find out the relat ion between the structure of surfactants and their performances. The g iven polymerizable surfactants mere synthesized for using in the emuls ion polymerization. Three groups of dialkyl maleates-nonionics, cation ics, and zwitterionics-with different chain lengths of hydrophobic alk yl group are investigated. Critical micelle concentration (cmc) values are determined for mater soluble surfactants, It is found that cmc de creases with increasing length of the hydrophobic alkyl group. For non ionic and cationic surfactants interfacial tension at the interface be tween water and dodecane is measured. Droplet size in oil-in-water (O/ W) emulsions is determined for all given surfactants. Cationic and zwi tterionic dialkyl maleates with the longest investigated alkyl chain ( R = C16H33, C17H35) provide good stability of O/W emulsions. In order to compare the obtained results, measurements with well-known surfacta nts-nonionicnonylphenol-poly(ethylene oxide) (NPEO(10)) and cationic h exadecyltrimethylammonium bromide (CTAB)-are performed.