| In this thesis,firstly,we synthesized a series of Y shape surfactants and investigated their application inγ-ray radiation induced(mini)emulsion polymerization and in preparation of the magnetite/polystyrene(PS) composite materials.Then,we synthesized a series of Gemini surfactants and investigated their application inγ-ray radiation induced miniemulsion polymerization.We also prepared monodisperse carboxyl- functionalized polystyrene particles for preparation of biocompatible microcapsules and investigated their application in the preparation of raspberry-like particles for the construction of superhydrophobic particulate film. The main results obtained in this dissertation are described as follows:1.The synthesis of Y shape surfactants and their application inγ-ray radiation induced(mini)emulsion polymerization and in the preparation of the magnetite/polystyrene composite materials.1) A series of Y shape surfactants were synthesized and characterized by FT-IR and 1H-NMR spectra.We measured the Critical Micelle Concentration(CMC) value of the Y shape surfactants at pH=9 in the water.The results showed that with increase of the volume of the Y shape surfactants' branched groups,the CMC value increased from 6.39* 10-5g/ml to 4.16* 10-4g/ml.2) We investigated the preparation of PS latex particles from radiation induced miniemulsion polymerization using Y shape surfactants as the sole stabilizer. The surface tension of the latexes were investigated,kinetics analysis shows that there is no constant rate stage which seems to indicate a droplet nucleation mechanism.TEM and LPZPA were used to observe the polystyrene latex particles and original droplets,respectively.The results showed that the emulsifiers act not only as the surfactants,but also as the so-called "cosurfactant".3) We investigated the stability of ammonium acrylate inverse emulsion using Y shape surfactants as stabilizers.The results showed that with increase of the volume of the Y shape surfactants' branched groups,the stability of the inverse emulsion increased.The stability of the inverse emulsion by: AcOA |
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