The Design Of The New Reactive Block Copolymer, Synthesis And Application Of Research

In this thesis, on the basis of reversible addition-fragmentation chain transfer Polymerization, a series of star polymers and amphiphilic block copolymers were synthesized by RAFT using dibenzyl trithiocarbonate (DBTTC) as chain transfer agents, and were characterized by different means as IR,GPC,~1H-NMR,AFM etc in details. We also studied amphiphilic block copolymers prepared as polymeric surfactant and their applications in miniemulsion polymerization. The main contents included three aspects which were summarized as follows:Star polymers were synthesized by one pot using the linear macro chain transfer agent. The linear macro chain transfer agent PnBA was prepared by RAFT polymerization, and then the coupling reactions of PnBA in the presence of HDDA produced the star polymers. The star polymers which had HDDA core and butyl acrylate shell could be formed by one pot synthesis in toluene solvent. Molecular weight of the star polymers were about ten thousands and its PDI was below 1.19. The molar ratio of HDDA and PnBA influenced the yield of star polymers. The results showed that the higher molar ratio, the higher yield. But in excess of a certain ratio, it would generate gels.PSt-b-P (St-co-MAn)-b-PSt was synthesized under the control of chain transfer agents, amphiphilic block copolymers could be self-assembling into nanoscalled micelle in polar and nonpolar solvents. Star polymers were formed after core cross-linking of these copolymers by hexanediamine. The experiment results showed that the reverse micelles which have hydrophilic core and hydrophobic shell had the morphology of sphere with diameter ranging from70nm to150nm, molecular weight of the star polymers was about 1 million, and PDT was about 1.14.Amphiphilic block copolymers P(St-co-MAn)-b-PBMA-b-P(St-co-MAn), with certain molecular weight (Mn=24017) and relatively narrow molecular weight distribution (Mw/Mn =1.31), was prepared by by RAFT polymerization firstly. And then aminolysis reaction of lauryl amine and n-octyl amine. The obtained MPS-1 and MPS-2 was used as polymeric surfactant in miniemulsion polymerization of methyl methacrylate and n-butyl acrylate. Particle size distribution and the stabilization of emulsion were effects by the time of ultrasonic, two polymeric surfactants and HD content. The results showed that these type of polymeric surfactants display good performances in the stabilization of MMA and nBA emulsion, we could obtain the morphology of sphere with diameter ranging from 100nm to 200nm.