Synthesis And Surface Properties Of Fluorinated Amphiphilic Polymer In Ionic Liquids

Hyperbranched polymer based on the dendritic molecular structure has attracted attention due to its special physical and chemical properties and potential applications in recent years. Ionic liquids have been applied in many fields since its excellent physical and chemical properties and features, including low boiling points, widely boiling range, non-volatile, less pollution, environmentally friendly, controlled polarity and amphipathicity, good solubility, etc. In order to achieve the purpose of "Green", we synthesized environmentally friendly fluorinated hyperbranched macromolecules using glycidol which owned good biological compatibility and easy biodegradation and fluorinated acrylate with short carbon chains. The surface behavior was also studied in ionic liquids.The framework of this dissertation mainly covered two parts. In the first part, a series of well-defined fluorinated amphiphilic hyperbranched polymer were synthesiz-ed using hydrophilic hyperbranched polyglycerol as core and hexafluorobutyl acrylate as monomer. In the second part, surface tension and micellar behavior of fluorinated amphiphilic hyperbranched polymers inl-butyl-3-methylimidazolium tetrafluorobora-te ([bmim][BF4]) were studied using the dynamic surface tension (SFT) and dynamic light scattering (DLS) measurement. Related conclusions were also obtained.The first part:preparation and characterization of novel fluorinated amphiphilic hyperbranched polymerThis dissertation involves the preparation and characterization of novel fluorinated amphiphilic hyperbranched polymer. Hyperbranched polyglycerol were synthesized using1,1,1-Tris(hydroxymethyl)propane (TMP) as initiator and glycidol as monomer, via anionic ring-opening multibranching polymerization (ROMBP). The preliminary products were reacted with2-bromoisobutyryl bromide to prepare macromolecular initiator. Then the macromolecular initiator was further reacted with hexafluorobutyl acrylate monomer to obtain the final products. The structure of products were confirmed by1H NMR,13C NMR,19F NMR and FT-IR, GPC, etc.The second part:research of SFT and DLS of fluorinated amphiphilichy hyperbranched polymer in ionic liquid [bmim][BF4].A series of different concentrations of solution were prepared, using fluorinated amphiphilichy hyperbranched polymers as solute and [bmim][BF4] as solvent. The relationship between molecular structure and the SFT behavior were discussed. The SFT of the solution decreased significantly with the increase of the solution concentration in a certain range. Especially, longer branched fluorinated groups are inclined to produce shorter time for equilibrium SFT and lower critical micelle concentration. Moreover, two kinds of aggregates were formed in the range of the DLS in the solution-unimolecular and multimolecular micelles. The diffusion coefficient were evaluated with Ward and Tordai’s equation depending on the dynamic surface tension test data. The calculation of diffusion coefficient illustrate the dynamic surface tension data are consistent with diffusion-controlled mechanism at the initial adsorption stage, and mixed diffusion-controlled adsorption mechanism dominated the adsorption at the end of the adsorption process.