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Pei and Surfactant Properties of Interaction

Author: WuQiuHua
Tutor: SongShiLi
School: Henan Normal
Course: Polymer Chemistry and Physics
Keywords: AOT PEI Reverse micelle Nonylphenol polyoxyethylene ether Interaction
CLC: O633.2
Type: Master's thesis
Year: 2010
Downloads: 107
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Abstract

In recent decades, the study of the interaction between a surfactant and a water-soluble polymer has been very active. This thesis polycation in the aqueous phase polymer electrolyte polyethylene imine (PEI) and the anionic surfactant complex through electrostatic interaction at different concentrations, the system on the critical micelle concentration (CMC) of the surfactant, the pH value, particle size, fluorescence spectra and aggregation number, transmittance, and zeta potential. It was found that the system after the CMC value of the complex slightly increased, but also by the determination of the conductivity of the different concentrations of system, the results show that the conductivity increases with the content of the PEI is increased from 0.01% to 0.1% increase in. Meanwhile, through the determination of the pH of the system in different concentrations, we found that the the AOT concentration increase in the system different concentrations have little effect on pH. Dynamic light scattering is a method of detecting the common method of particle size, used in this experiment in a dynamic light scattering method of AOT concentration 4mmol / L and 8mmol / L when the particle size of the different concentration of PEI system measurement results showed that 4mmol / L and 8mmol / L System diameter with the the PEI content increase is first reduced and then increased. Pyrene as a fluorescence probe, benzophenone as a quencher, Fluorescence Spectroscopy AOT concentration 8mmol / L of PEI content of 0.01%, 0.05%, changes in the polarity of the system micro-environment, the experimental results show that adding of PEI microenvironment polarity of the system becomes large. This experiment was also measured under different concentration of PEI, AOT / PEI / water system transmittance, which was found that the transmittance decreased with increasing PEI content System. NaNo-ZS90 the granulometer measured PEI content of 0.05% AOT concentration Zeta potential of the system, and gradually reduced found with elevated concentration of AOT Zeta potential of the system, and then almost reached a stable value. When the concentration of AOT fixed 8mmol / L with PEI content increase system Zeta potential change little. The surfactant AOT inverted micelle microemulsion is formed in the non-aqueous solvent is often a lot of literature on the characteristic parameters have been reported, but due to the selected temperature, test methods, different, sometimes the difference is very large and theoretical reported yet more common this topic AOT / PEI reverse micelles formed in n-hexane, a preliminary exploration of the AOT / n-hexane percolation mechanism, the different ω0 proportion and temperature on the conductance impact of percolation conductance activation energy were estimated according to the Arrhenius-type formula. Experiment solubilization capacity in the system of reverse micelles formed at room temperature, and the temperature on the solubilization capacity to take advantage of the conductance curves visits the AOT / n-hexane system induced by water and aqueous solutions of different concentrations of PEI The percolation was also determined fixed different ω0 when the influence of the temperature on the conductivity K and the measurement of the fixed ω0 5, CP / CAOT = 0.23 when the conductivity of the system. Nuclear magnetic? Resonance (NMR): As ω0 changes the determination of 1H chemical shifts in different ω0 (3, 10, 20), reverse micelle system AOT / n-hexane / water system in the 1H chemical shift value migration from 4.113ppm 4.509ppm Add PEI aqueous solution, the same phenomenon is also observed, and the chemical shift value is slightly reduced, which is mainly due to various systems in different types of water with the counter ions and the respective head groups mutual role in the decision. This paper concludes with some reference value for further studies of the nature of the reverse microemulsion. Also studied the polyethylene imine (PEI) and the interaction between the nonionic surfactant NP-15, by the surface tension, and polarized light microscopy, fluorescent method, on the complex system after the critical micelle concentration (CMC) , cloud point, liquid crystal, aggregation number, and changes in pH Determination of the effect on them, in order to provide a theoretical basis for PEI with a non-ionic surface active agent complex applications. Experimental results show that the compound after both the CMC value of the weak interaction system is less obvious changes; with increasing PEI content, the cloud point of the system decreased, while the elevated pH of the system. Was found in a comparative pH value after the impact on the system, the pH value increased, and the temperature of the liquid crystal disappears also will increase, and at higher pH system lower the CMC value, significantly altered the Critical Micelle concentration. Experiments using fluorescent probe method under different pH values ??of the composite system in the microenvironment polarity and micellar aggregation number determined, found that the aggregation number of micelles at different pH values ??and the micro-environment have undergone significant changes. Them of the nature of the compound of the summary has been some improvement, is conducive to the actual application.

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