Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (3): 271-279.DOI: 10.11944/j.issn.1000-0518.2020.03.190242

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Synthesis and Properties of Carboxylate Gemini Surfactants

ZHANG Chenglu(),SONG Fulu,ZHOU Long,HAN Zhen,BAI Ru,YANG Fan,WANG Nan,SUN Yuedong   

  1. College of Chemistry and Chemical Engineering, Liaoning Normal University,Dalian,Liaoning 116029,China
  • Received:2019-09-10 Accepted:2019-12-05 Published:2020-03-01 Online:2020-03-10
  • Contact: ZHANG Chenglu
  • Supported by:
    Supported by the Science and Technology Project of Liaoning Education Department(No.2009A426)

Abstract:

To screen environmental friendly new gemini surfactants, five carboxylate-type gemini surfactants EODPN1-EODPN 5 [2,2'-(1,2-CH2CH2-di-O-)-di-(4-CnH2n+1COPhCOONa), n=5, 7, 9, 11 and 13] were synthesized from salicylic acid. The structures of the target products were confirmed by nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared (FT-IR) spectrometer. The properties of EODPN as surfactants were explored, and the relevant thermodynamic parameters were obtained by theoretical calculation using the Gibbs surface adsorption equation. The results show that EODPN has excellent surface activities, extremely low critical micelle concentration (CMC) values (minimum 0.4 mmol/L), good surface tension reduction performance (minimum 29.74 mN/m) and high surface adsorption per unit area Γ(up to 3.37×10-6 mol/m2). By changing the length of the hydrophobic alkyl carbon chain, the surface activity and self-assembly ability of EODPN were optimized, and EODPN4 was selected as the best surfactant. Based on EODPN4 which can be stably combined with copper ions, the detection of surfactant content is realized.

Key words: gemini surfactant, carboxylate, thermodynamic parameters, surface activity