Study On The Synthesis And Characterizition Of Hyper-branched Polyester-based Ferrocene

Ferrocene and its derivatives have become one of the important metal organic compounds for the unique molecular structure, the specific electrochemical, magnetic, catalytic and redox properties. The studies on this field have attracted broad interest in the domestic and foreign research region. The hyper-branched polyesters have highly branched 3D structure and a large number of reactive end groups, they could obtain much different properties by end-modified. It could further obtain excellent performance based on the original features that introduce ferrocene to the highly branched polyester to form hyper-branched ferrocene. So the hyper-branched ferrocene can be widely used in functional materials.In this dissertation, the 1-4 generation of hydroxyl-terminated hyper-branched polyesters were synthesized by the quasi-one-step method. On the basis of these, hyper-branched polyester-based ferrocene (Gl-Cp-G4-Cp) were synthesized with the hyper-branched polyesters as central core and the ferrocene molecules as shell through the esterification reaction between 1-4 generation of hyper-branched polyesters and ferrocene carboxylic acid. The best process conditions of synthesis were worked out by the studies of reaction temperature, time, amount of catalyst and other test conditions in the synthesis.The functional groups structure and the properties of hyper-branched polyester-based ferrocene were characterized by FTIR,1H NMR, UV-VIS, DSC and TG technique. Their UV absorption properties were analyzed and their thermal stability and glass transition temperature were determined. The hydroxyl value and grafting rates of ferrocene on the end groups of the hyper-branched polyester were calculated by the hydroxyl value titration method.The results of FTIR and 1H NMR showed that the ferrocene groups had been effectively grafted onto the hyper-branched polyester matrix. It indicated the validity of the reaction between the ferrocene and the hyperbrancher polyester matrix. The results of TG and DSC showed that the hyper-branched polyester-based ferrocene began to decompose at 200℃, which indicated that it has good thermal stability. The UV-VIS analysis showed that it endowed polyesters with absorption properties to the ultraviolet light after grafting the ferrocene to the hyper-branched polyesters. These properties provided the prerequisite for the application of them as anti-UV-oxidation materials. The grafting rate of ferrocene was 67.2% through the determination of hydroxyl value.After mixing the hyper-branched polyester-based ferrocene with PP/PE, the plastic materials of PP/PE were prepared by the way of using compression molding formation. They were shone in ultraviolet light and natural light for several months. The anti-radiation property of the hyperbrancher ferrocene polyesters adding to plastic was completed by the study of mechanical properties and the analysis of fracture surface. It showed that the hyper-branched polyester-based ferrocene have good properties of anti-UV and anti-sunlight. The results also proved that since the hyper-branched polyester-based ferrocene can absorb and shield the ultraviolet light, it will play a important role in inhibiting oxidation of aging.