Abstract
Three cationic silicone surfactants, (2-hydroxyethyl)-N,N-dimethyl-3-[tri-(trimethylsiloxy)]silylpropylammonium chloride (Si4ACl), (2-hydroxyethyl)-N,N-dimethyl-3-[bis(trimethylsiloxy)methyl]silylpropylammonium chloride (Si3ACl), and (2-hydroxyethyl)-N,N-dimethyl-3-[bis(trimethylsilylmethyl)methyl]silylpropyl-ammonium chloride (Si3C2ACl), with the same headgroups and different hydrophobic groups were synthesized. Their aggregation behavior in aqueous solution was investigated by surface tension and electrical conductivity. The results show that all the three cationic silicone surfactants perform admirable surface activity. Because of the effect of the hydrophobic groups, the critical micelle concentration values increase following the order Si3C2ACl < Si4ACl < Si3ACl, and Si3C2ACl packs more compactly at the air/water interface compared with Si4ACl and Si3ACl. Electrical conductivity studies show that all the three cationic silicone surfactants have low degree of counterion binding. Thermodynamic parameters (\( \varDelta\;H_m^0 \), \( \varDelta S_m^0 \), and \( \varDelta G_m^0 \)) of micellization derived from electrical conductivities indicate that the micellization for both Si3C2AC and Si3ACl in aqueous solution is enthalpy-driven, and that for the Si4ACl is entropy-driven. For the heat capacities, \( \varDelta\;c_{m,p}^0 \), values are positive for Si4ACl, indicating that there is an attractive interaction between the nitrogen atom of one surfactant molecule and the oxygen atom of another surfactant molecule for Si4ACl.
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We gratefully acknowledge the financial support from the National Natural Science Foundation of China (grant no. 20874057) and the Key Natural Science Foundation of Shandong Province of China (ZR2011BZ001).
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Tan, J., Zhao, P., Ma, D. et al. Effect of hydrophobic chains on the aggregation behavior of cationic silicone surfactants in aqueous solution. Colloid Polym Sci 291, 1487–1494 (2013). https://doi.org/10.1007/s00396-012-2885-6
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DOI: https://doi.org/10.1007/s00396-012-2885-6