Properties of Mixed System of N‐Coco Propylene Bis‐guanidine Acetate (CPGA) and Nonionic Surfactants

Abstract

To study the effect of nonionic surfactant on the properties of cationic surfactant N‐coco propylene bis‐guanidine acetate (CPGA), different ratios of CPGA and fatty alcohol polyoxyethylene ether (AEO9) or alkyl polyglycoside (APG1214) were mixed, respectively. The surface activity, interaction parameters, and the application performances of wetting, emulsification and foam of the mixed system were investigated systematically. After the addition of AEO9 or APG1214, the critical micelle concentration (CMC) of mixed system changes distinctly. The results of interaction parameters indicate that the synergistic effects exist between CPGA and AEO9 or APG1214, and the micellizations of the mixtures are spontaneous. The change trend of the equilibrium contact angle is similar to that of the surface tension at CMC (γCMC) for the corresponding mixed system. The improvement of wettability of CPGA by AEO9 is significantly stronger than that by APG1214. The emulsifying capacity of CPGA to liquid paraffin or soybean oil is almost enhanced by AEO9 or APG1214. AEO9 has clear defoaming effect on CPGA, and only a small amount of APG1214 can increase the foam stability of CPGA.

Synergism and properties of binary mixtures based on an arginine dodecyl ester surfactant

“… n = x σ 1 n 1 + (1 − x σ 1 ) n 2 ,where n 1 = 3 and n 2 = 1 for pure ADDE and APG, respectively, and x σ 1 is the molar fractions of ADDE in the mixed adsorption interface. 41…”

“…where n 1 = 3 and n 2 = 1 for pure ADDE and APG, respectively, and x s 1 is the molar fractions of ADDE in the mixed adsorption interface. 41 For an ideal mixed system, that is no mutual interaction between the two components, the CMC value of the mixed system (cmc ideal ) can be obtained according to Clint's model as shown in eqn (4). where a 1 is the molar fraction of ADDE in the total mixed solution (a ADDE ), c m 1 and c m 2 are the CMC values of pure ADDE and APG individually.…”