SURFACE AND THERMODYNAMIC PROPERTIES OF 1,3-DIOXALANE DERIVATIVES

Surface and thermodynamic properties of 1,3-dioxalane derivatives, non -ionics and anionic-non-ionic hybrids, in aqueous solution were studie d at 20, 35 and 50 degrees C. This study includes the effect of polyox ypropylene chain length and temperature on the values of the critical micelle concentrations, maximum surface excess and minimum surface are a of 2-acetonyl 2-methyl 4[alpha-(propyl poly-propenoxy ether) hexadec yl] 1,3-dioxalane (Ia-d) and 2-sodium carboxylatomethyl 2-methyl 4[alp ha-(propyl polypropenoxy ether) hexadecyl] 1,3-dioxalane (IIa-d). Ther modynamic data obtained indicate that adsorption is preferable for 1,3 -dioxalane non-ionic surfactants, and micellisation for the anionic-no nionic 1,3-dioxalane surfactants. (C) 1998 Elsevier Science B.V.