Citation: WANG Hai-Ying, CHAI Li-Yuan, LV Chun-Xu. Surface Activity of a Mixed Aqueous Solution of Poly(6-dodecyl-2-(acrylamidomethoxy)-1,3,6,2-dioxaza borocane) and Sodium Dodecylbenzene Sulfonate[J]. Acta Physico-Chimica Sinica, ;2010, 26(01): 73-78. doi: 10.3866/PKU.WHXB20100104
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Poly(6-dodecyl-2-(acrylamidomethoxy)-1,3,6,2-dioxaza borocane) (PADB) is a novel amphiphilic polyborate. The surface activity of the polyborate PADB with various weight-average molecular weights (Mw) in an aqueous solution was measured by surface tension methods. Using regular solution theory, the interaction between PADB and sodium dodecylbenzene sulfonate (SDBS) in 0.5 mol·L-1 NaCl aqueous solution was studied and compared with the monomeric ADB/SDBS mixed system. Results showed that the Mw of the polyborate PADB ranges from 1.5×104 to 3.5×104. The increasing Mw of PADB raises their critical micelle concentration (cmc) in aqueous solutions, however, the surface tension at cmc (γcmc) can also reach about 31 mN·m-1 (298 K), which indicates excellent surface activity. By PADB addition, two transitions occurred in the curves of the surface tension (γ) vs logarithmconcentration of SDBS (lgcSDBS) and were labeled c1 and c2, respectively, and with c1<c2<cmcSDBS. The surface activity of the SDBS aqueous solution increases with PADB addition and the reduction of its Mw. The PADB solution can be regarded as a special monomeric ADB solution. The micellization parameters of the PADB/SDBS mixed solution were calculated by regular solution approximation. The interaction parameter βm value of the PADB/SDBS mixed micelles is about -2.4 - -4.7, the activity coefficient f1m<1, demonstrating a strong synergistic interaction between PADB and SDBS. |βm| reaches a maximum when the molar fraction (x1) of the monomeric ADB unit of PADB in the mixed surfactants is 0.47. By comparison to the monomeric ADB/SDBS mixed system, the PADB/SDBS system possesses a larger |βm| value when x1 is below 0.8 and a stronger interaction effect is apparent. As x1 increases, the molar fraction (x1m) of the monomeric ADBunit of PADBin the PADB/SDBS mixed micelles increases linearly but this increase is less than that of the monomeric ADB/SDBS mixed system.
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Keywords:
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Surfactant
, - Polyborate,
- Mixed micelles,
- Interaction,
- Micellization parameter
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