Design, Synthesis And Character Study Of Dendritic Acrylic Esters

Dendrimer is a new-type function macromolecule chemical compound whose specialties are to design the molecular size.shape and functional group at the molecular level. According to its own specialties, studying systematacially the molecular structure and performance, developing the function macromolecule with new-type terminal group is an important research direction. The surface terminal group can carry on function transform. There are amido, hydroxyl, carboxyl, ester base, acylamino group , metal chelate compound etc that have already been reported at present. Because there are active sites among the center and inside of dendrimers.,Those make this kind of macromolecule have well enough application prospects in drug deliver, catalyst carrier, gene therapy, metal millimicron composite and membrane material etc.The thesis has introduced briefly the structure and performance of dendrimers, and has reviewed the newest progress in synthesizing and functional of dendrmers systematically. A new method of terminal group transforms of dendrimers was put forward. The method is that functional groups were grafted into dendrimers with Michael addition reaction and amidation condensation reaction by molecule design. Firstly a new-type dendritic twelve esters with ethylenediamine as core has been synthesized successfully. The molecular structures of the product have been characterized by means of element analysis, infrared spectrum(IR) and nuclear magnetic resonance(NMR). The validity of the molecular structure of dendrimer was proved tomatch with the designing target molecularThis thesis has explored tentatively the performance of dendrimers synthesized firstly, by the structure characteristics of dendrimers. The surface tensions of 0.5Gpoly(amidoamine)(PAMAM) and 0.5G dendritic twelve esters in the acetone were measured by drop-volume method. The viscosity-reducing result of half generation PAMAM and 0.5G dendritic longchain esters on oil was discussed emphatically. That these two kinds of dendrimers do not have surface activation basically in the acetone was found. Half generation PAMAM and 0. 5 generation dendritic longchain esters have viscidity of dropping to the thick oil, At the concentration of 0.6%, the viscosity-reducing result is best. The viscosity-reducing rates of 0.5 G PAMAM, 1.5G PAMAM and 2.5G PAMAM are respectively 25.4%, 26.0% and 28.2%. The rates of 0.5G dendritic eight esters, twelve esters and eighteen esters are 24 respectively 26.2%, 28.3% and 32.4%. In addition, the viscosity-reducing result of 1.5G dendritic twelve esters on oil was dicussed. The rate is 30.6% at the concentration of 0.6%.The relation of the thick-oil viscosity-reducing mechanism and the structure of viscosity reducer was explored. Those were the base of designing and synthesizing a new-type and single oil-viscosity reducer. The innovation of this thesis that dendrimers were applied to the viscosity-reducing fields firstly, and widened the applying fields of the new-type dendrimers.