【摘要】 为筛选环境友好的新型双子表面活性剂,以水杨酸为原料设计合成了5个羧酸盐型双子表面活性剂EODPN1-EODPN5[2,2’-（1,2-CH₂CH₂-二-O-）-二-(4-C_nH_2n+1COPh COONa),n=5,7,9,11和13],并通过核磁共振波谱仪（NMR）和傅里叶变换红外光谱仪（FT-IR）等对目标产物进行了结构表征。探究了EODPN作为表面活性剂的性能,并利用Gibbs表面吸附方程,通过理论计算得到相关热力学参数,结果表明,目标分子具有优异的表面活性,临界胶束浓度（CMC）值低（最低达0. 4 mmol/L）,表面张力性能优良（最低达29. 74 m N/m）,单位面积表面吸附量（Γ）高(最高达3. 37×10^-6mol/m²)。通过改变疏水基烷基碳链的长度,优化了EODPN的表面活性和自组装能力,筛选出EODPN4为最佳的表面活性剂。借助EODPN4能与铜离子稳定结合,实现了表面活性剂含量的检测。更多还原

【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-C_nH_{2n + 1}（COPhCOONa）,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 to3. 37 × 10^-6mol/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.更多还原