Rheological behavior of PAA - CnTAB complex: Influence of PAA charge density and surfactant tail length in PAA semidilute aqueous solution

Qiang Wu, Miao Du, Tao Ye, Yong Gang Shangguan, Jian Ping Zhou, Qiang Zheng

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Interactions between anionic polyelectrolyte, poly(acrylic acid) (PAA), and cationic surfactant, alkyltrimethylammonium bromide (Cn TAB), were investigated by rheological measurements in semidilute PAA solution. The dependences of the rheological behavior on the chain length of the surfactant, PAA neutralization degree, and temperature were discussed. The results revealed that both dodecyl and cetyltrimethylammonium bromides (C12TAB and C16 TAB) could increase the viscosity of PAA solution when the surfactant amounts surpassed a critical surfactant concentration (Cc), and Cc of C16TAB was lower than that of C12TAB at same PAA neutralization degree. The increase of viscosity is attributed to the surfactant micelles bridging of the polymer chains and confine the mobility PAA chain. On the other hand, it is found that the hydrogen bonding also played an important role in the PAA - CnTAB system, especially in lower neutralization degree PAA solution, which results in the viscosity increase rapidly with the added surfactant into lower neutralization degree PAA solution.

Original languageEnglish
Pages (from-to)911-918
Number of pages8
JournalColloid and Polymer Science
Volume287
Issue number8
DOIs
StatePublished - Aug 2009
Externally publishedYes

Keywords

  • Hydrogen bonding
  • Micelle
  • Polyelectrolyte
  • Surfactant
  • Viscosity

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