Studies On Properties Of Rosin-Based Anionic Bola Form Surfactants And Its Interaction With DTAB Or TX-100

Bolaform surfactants are the amphiphilic compounds which are composed of hydrophobic chain connecting two hydrophilic groups, and they are widely used in many fields because of its unique structure and properties. The surface chemical properties, micellization behavior and aggregation behavior of dehydroabietic acid sulphonate Bola surfactants (dehydroabietic acid ethylene glycol diesters double sulfonate (DEDS), dehydroabietic acid hexanediol glycol diesters double sulfonate (DHDS) and dehydroabietic acid decamethylene glycol diesters double sulfonate (DDDS)) were studied. The interaction between DEDS and dodecyltrimethylammonium bromide (DTAB) or Triton X-100 (TX-100) were inverstigated. The main research contents and conclusions are summarized as follows:1. The surface properties of dehydroabietic acid sulphonate Bola surfactants were investigated by surface tension method. The critical micelle concentration (cmc), the surface tension at cmc (?dmc), saturated extent of adsorption (T?) and Bola molecule cross-sectional area (Am) were obtained from their surface tension curves. The results show that DEDS, DHDS and DDDS have high surface activity. The surface activity enhanced after adding inorganic salt or raising temperature. The thermodynamic parameters (?Gm0, ?#0 and ?Sm0) of the micelle formation of DEDS, DHDS and DDDS were calculated according to mass action model. The results indicate that the micelle formation process was spontaneous and entropy-driven. The TEM technique was used to observe the shape of the aggregates and the results show that DEDS formed vesicles, DHDS formed rod micelles and DDDS formed fibrous structure.2. The surface properties of DEDS/DTAB mixed system were investigated by surface tension method. The cmc, ?cmc, T? and Am of DEDS/DTAB mixed system were obtained from their surface tension curves. The results show that DEDS/DTAB mixed system has high surface activity compared with a single surfactant. The cmc of ideal mixing system were calculated by regular solution theory. The experimental values were lower than calculated values, which suggesting that negative deviations from ideal mixing system. The molecular interaction parameters ?m and ?s were calculated according to Rubingh theory and Rosen theory. The ?m and ?s were great negative values, which suggesting that there is strong interaction between DEDS and DTAB. The DEDS/DTAB mixed system has synergistic effect on the micelle formation and the reduction of surface tension efficiency and ability. The TEM results show that DEDS/DTAB mixed system formed vesicles.3. The surface properties of DEDS/TX-100 mixed system were investigated by surface tension method. The cmc, ?cmc, T? and Am of DEDS/TX-100 mixed system were obtained from their surface tension curves. The results show that DEDS/TX-100 mixed system has high surface activity compared with a single surfactant. The cmc of ideal mixing system were calculated by regular solution theory. The experimental values were lower than calculated values, which suggesting that negative deviations from ideal mixing system. The molecular interaction parameters ?m and ?s were calculated according to Rubingh theory and Rosen theory. The ?m and ?s were larger negative values, which suggesting that there is relatively strong interaction between DEDS and TX-100. The DEDS/TX-100 mixed system has synergistic effect on the micelle formation and the reduction of surface tension efficiency, but has not synergistic effect on the reduction of surface tension ability. The TEM results show that DEDS/TX-100 mixed system formed rod micelles.4. The absolute value of molecular interaction parameters ?m and ?s of DEDS/DTAB mixed system were larger than DEDS/TX-100 mixed system, which showing that the interaction between DEDS and DTAB is stronger than the interaction between DEDS and TX-100.