Abstract
PEG based cationic trisiloxane surfactants (Si3min-EO3, Si3min-EO4, and Si3pyr-EO4), containing poly(ethylene glycol) and imidazolium/pyridinium headgroups, were prepared through thiol-ene reaction and confirmed by 1HNMR and FT-IR. Their micellization in aqueous solution were investigated using surface tension measurements, electrical conductivity measurements, dynamic light scattering (DLS), and transmission electron microscope (TEM). Owing to the introduction of ethylene glycol segments onto both end of trisiloxane hydrophobic parts, the PEG based cationic trisiloxane surfactants may adopt the ethylene glycol groups with a suitable conformational structure on the air/water interface resulted in their lower πCMC values, larger γCMC (~33 mN m−1) and Amin values compared with permethyltrisiloxane surfactant, even their corresponding monomeric surfactant (Vi-Si3minCl and Vi-Si3PyrCl). Meanwhile, in aqueous solution, the micellization process of Si3min-EO3, Si3min-EO4, and Si3pyr-EO4 were enthalpy driven and spherical aggregates were observed by TEM.
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