Interfacial activity and de-emulsification performance of some new amphiphilic cardanol-based phenol-amine resin block polyethers

Four amphiphilic cardanol-based phenol-amine resin block polyethers (CPAE) with different contents of ethylene oxide and propylene oxide were prepared and were characterized by FTIR and H-1 NMR. The surface tension and the interfacial tension of four CPAE block polyethers were measured, and series of surface active parameters were also calculated. The surface activity and the interfacial activity of the CPAE block polyethers were correlated with their chemical structure. The cmc, (cmc), ?(max), and values decreased with an increase of the branching number and the molecular weight, but the A(min) value increased. The equilibrium interfacial tension decreased with the increase of the concentration and the molecular weight of the CPAE block polyethers. The results of de-emulsification revealed that the CPAE block polyethers showed interesting de-emulsification efficiency towards the simulated emulsions used in our work. The structure of the CPAE block polyethers could influence the de-emulsification performance, especially the molecular block. The de-emulsification mechanism of the CPAE block polyethers was studied using a single-droplet protocol and the dynamic data of drainage time, half-life time, and rupture rate constant obtained were consistent with the de-emulsification efficiency of the CPAE block polyethers. [GRAPHICS] .