Synthesis And Property Study Of Dendrimer As Demulsifier

Dendrimers are highly branched and reactive three-dimensional macromolecules, with all bonds emanating from a central core. Since their introduction in the mid-1980s, this novel class of polymeric materials has attracted considerable attention because of their unique structure and properties.Compared with traditional linear polymers, dendrimers have much more accurately controlled structures, with a globular shape, a single molecular weight rather than a distribution of molecular weights, and a large number of controllable peripheral functionalities. Now researches into the properties of this kind of macromolecular hasn't been too deep going, but a revolutionary breakthrough has been made in some applying field, such as drug deliver, catalyst carrier, gene therapy, sensor etc.In this paper, two types of polyamidoamine (PAMAM ) have been synthesized by divergent with ethylenediamine and ammonia as core respectively. The molecular structures of the product have been characterized by means infrared spectrum(IR) and terminal group analysis. The result demonstrated that the structures of the synthesized dendrimers accord with theoretical structures. The research method of surfactant is adopted to study the physical quantities of the new type macromolecular aqueous solution, such as intrinsic viscosity, surface tension, surface adsorbance, critical micelle concentration(CMC), HLB value and molecular dimension. The fact indicated that the intrinsic viscosity is related to the molecular structure, the surface activity is related to the terminal group construction, the HLB value is related to the extent of generation. Moreover, the molecular size is proved to the grade of nanometer by the adsorption experiment of surfactant. The public reports about some surface property of polyamidoamine haven't been published at present.The properties of this kind of new type macromolecular surfactant as crude oil demulsifier have been investigated emphatically. At the same time we have investigated the basic properties of PAMAM. The demulsifying capability of PAMAM for the simulated O/W emulsion of different system was evaluated.The result shows that although it has little surface activity, the different cores and generation of PAMAM, whose terminal group is amidogen, behaves well demulsification. The demulsification of PAMAM for the O/W emulsion is closely connected with the molecular core, terminal group and generation, which provided the foundation to design the new-type demulsifier molecule.