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通过预聚体法合成了水性阳-非离子聚氨酯表面活性剂(CPUS),利用红外光谱和核磁共振谱对聚合物的结构和组成进行了表征.并通过动态光散射(DLS)、透射电镜(TEM)、表面张力仪、稳态流变分析及荧光光谱法等系统研究了阳离子亲水扩链剂N-甲基二乙醇胺(MDEA)用量对CPUS表面张力、临界胶束浓度、流变性、胶束的尺寸、微极性和聚集行为的影响.TEM表明,CPUS胶束呈球形核壳结构.随着MDEA含量的增加,CPUS水溶液表面张力和临界胶束浓度(CMC)先减小后增大,其最低值分别为39.54 m N/m和1.99 g/L,胶束的平均粒径和分布系数逐渐减小.当浓度低于CMC时,光散射强度较低且变化缓慢,当浓度高于CMC时,光散射强度呈现逐渐增长趋势,胶束聚集数逐渐增加.随着MDEA含量的增加,乳液黏度增加,胶束间的相互作用增强,假塑行为增强.荧光光谱法表明随CPUS浓度增加,I1/I3值从1.8降低到1.3,I338/I334值从0.5升高到1.7,表明疏水基团聚集形成疏水微区,芘分子从水相极性环境转移到胶束疏水内核.随着MDEA含量的增加,胶束微极性和形成难度先减小后增加.
The aqueous cationic-nonionic polyurethane surfactant (CPUS) was synthesized by the prepolymer method. The structure and composition of the polymer were characterized by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The structure and composition of the polymer were characterized by dynamic light scattering (DLS), transmission electron microscopy TEM, surface tension meter, steady-state rheological analysis and fluorescence spectroscopy were used to study the effects of cationic hydrophilic chain extender N-methyldiethanolamine (MDEA) on CPUS surface tension, critical micelle concentration, Bundle size, micropolarity and aggregation behavior.EMT showed that CPUS micelles were spherical core-shell structure.With the increase of MDEA content, the surface tension and CMC of aqueous solution of CPUS first decreased and then increased , The lowest values were 39.54 m N / m and 1.99 g / L, respectively, and the average particle size and distribution coefficient of micelles decreased gradually.When the concentration was lower than CMC, the light scattering intensity was low and changed slowly, when the concentration was higher than CMC, the light scattering intensity showed a gradual increase trend, the micelle aggregation number increased gradually.With the increase of MDEA content, the emulsion viscosity increased, the interaction between micelles enhanced, the pseudoplastic behavior enhanced.Fluorescence spectroscopy showed that with the increase of CPUS concentration , I1 / I3 value decreased from 1.8 to 1.3, I338 / I334 From 0.5 to 1.7, indicating that the hydrophobic group aggregated to form hydrophobic micro-domains, and the pyrene molecules migrated from the aqueous polar environment to the micellar hydrophobic core. As the content of MDEA increased, the micro-polarity and formation difficulty of micelles first decreased After the increase.