Studies on Interaction of Hydrophobically Modified Polyacrylamide of a New Family with Cationic Gemini Surfactant

Abstract

A new family of hydrophobically modified polyacrylamides (HMPAM) was synthesized via homogeneous copolymerization of acrylamide (AM) and anionic surface-active monomer of acrylamide-type, sodium 2-acrylamido-tetradecane sulfonate (NaAMC₁₄S) in aqueous solution. The copolymers NaAMC₁₄S/AM with microblock structures and with different chain microstructures were obtained by varying the copolymerization factors, such as the feed ratio of NaAMC₁₄S to AM and the amount of added electrolyte NaCl and initiator. The interaction between copolymers NaAMC₁₄S/AM and cationic gemini surfactants, C₁₂C₃C₁₂Br₂ and C₁₂C₆C₁₂Br₂, was studied by using viscosimetry and fluorescent probe technique. The results show this new family of HMPAM, NaAMC₁₄S/AM, has very strong interaction with gemini surfactants, and their aqueous solutions exhibit unique rheological properties.

Keywords:

• Acrylamide
• anionic surface-active monomer
• gemini surfactant
• hydrophobic association
• mixed micelle
• polyacrylamide
• rheological propertie

Acknowledgments

The authors are grateful to the Science Foundation of Province Shanxi of China for financial support of this work.

Notes

^a Weight fraction of initiator K₂S₂O₈ in the total feed.

^b Aggregation number of NaAMC₁₄S.

^c Intrinsic viscosity (ml/g).