Study On Theacrylic Emulsion Polymerization Process Of Micellization Behavior Of Emulsifier Using Fluorescence Probe Technique

The core-shell acrylic emulsion polymerization is very popular in the emulsion and the new materials research at present. In the reaction of core-shell acrylic emulsion polymerization, the emulsifier plays a critical role. Although it is not directly involved in the reaction, however, the type, the amount and the ways to add it will directly influence whether emulsion's polymerization reactions can proceed smoothly or not , and ultimately, will influence the characteristics of the obtained emulsion; especially will have a direct influence on the formation of core-shell's structure .Fluorescent probe pyreneⅠ1 /Ⅰ3 peak can be used as an important directive to determine the polarity of the micro-environment. . Through the distribution of pyrene micro-environment polarity in the water phase and the hydrophobic phase, important information of hydrophobic association structure can be obtained .With the influence of the amount and the different proportions of emulsifiers on acrylic core-shell emulsion polymerization's reaction process, the internal aggregating structure in the process of acrylic latex emulsion polymerization will change, and pyreneⅠ1 /Ⅰ3 peak will also change . Therefore, the paper first conducts a study on the emulsifier's micellar behavior in the process of acrylic core-shell emulsion polymerization through the technique of fluorescent probe, probes into the influence of emulsifiers on acrylic core-shell emulsion polymer properties, and do the comprehensive verifications through the Grain Path Analyzer . This study mainly focuses on the following four areas:①The critical micelle concentration(CMC) of sodium dodecyl sulphonate (AS) and polyoxyethylene nonyl phenol ethers(Oπ-10)composite emulsifier was detected and compared with the CMC of AS and Oπ-10 respectively by fluorescence probe technique according to the ratio of fluorescence intensity corresponding to first vibronic peak (Ⅰ1,λ=373nm) and third vibronic peak(Ⅰ3,λ=384nm) of pyrene(Ⅰ1 /Ⅰ3)which varied with the emulsifier concentration②Use Pyrene as the fluorescent probe, benzophenone as quenching agent,and make use of the fluorescent probe to determine AS and the accumulation number of the emulsifier (AS+ Oπ-10),and discuss the influence of the amount of Oπ-10 in the emulsifier on the accumulation number.③the paper does researches on the emulsifier's micellar behavior in the process of acrylic core-shell emulsion polymerization through the technique of fluorescent probe. discuss amount of emulsifie,emulsifie ratio on acrylic core-shell emulsion's polymer properties and morphology of latex particles . It shows that when the amonunt of emulsifier is 2g(mAS:m Oπ-10=1:1,Polymerization process of change in core-shell latex particles from the seed latex, Polymerization process of change in core-shell latex particles from the seed latex.④After going through many scientific methods and analysis on emulsion,such as connecting the particle size analysis with the film performance test, the results show that when the amonunt of emulsifier is 2g(mAS:m Oπ-10=1:1); synthetic emulsion has an excellent overall performance. This result is consistent with that obtained by fluorescence probe technique. Therefore, the polymerizationn structure of acrylic core-shell emulsion can be probed into after studying the emulsifier's micellar-aggregating behavior through the fluorescence probe technique.