Synthesis Of Different Architectural Polymers Via RAFT Heterogeneous Polymerization

Reversible Addition-Fragmentation Chain Transfer (RAFT) controlled aqueousdispersion polymerization has a fast polymerization rate, small viscosity of thepolymerization system, fast heat dissipation, environment-friendly, high solidcontent and the polymeric polymers exists in the forms of micro-and nano-sizecolloidal particles, which can be applied directly as products. In this thesis, westudied the RAFT polymerization mechanism in emulsion polymerization anddispersion polymerization systems by using the water soluble chain transfer agentsas stabilizers and RAFT polymerization control agents. Meanwhile, we realized thecontrol of the colloidal properties (colloidal stability, particle size and solid content)and RAFT living polymerization (polymer molecular weight, molecular weightdispersion and polymer conformation) in the emulsion polymerization anddispersion polymerization systems. We efficiently synthesized linear-branchedamphiphilic block polymers with conveniently adjustable branched degrees by usinghydrophilic macromolecule PDMA as chain transfer agents via RAFT emulsionpolymerization. Furthermore, we efficiently synthesized low dispersed corecross-linked star (CCS) polymers by using hydrophilic macromoleculepoly(N,N’-dimethylacrylamide)(PDMA), poly(poly(ethylene glycol) methyl ethermethacrylate)(PEGMA) and heat-sensitive poly(2-methoxyethyl acrylate-co-poly(ethylene glycol) methyl ether acrylate)(P(MEA-co-PEGA)) as macromoleculechain transfer agents via RAFT emulsion polymerization and dispersionpolymerization, and investigated their use as emulsifiers. The main contents arelisted as follows:1. In this paper, using of RAFT polymerization, PDMA as the macromolecular chaintransfer agent,n-butyl acrylate monomer,2,2’-azobis isobutyl amidine dihydrochlorideas initiator, we selected the appropriate proportion of each component and synthesizedamphiphilic linear-branched block polymers, and by changing the amount of branchedmonomer to study its impact on the degree of branching. 2. Using of RAFT polymerization and dispersion polymerization, water-solublemacromolecular chain transfer agent PDMA and PEGMA as the linear arm, wepolymerized the hydrophobic monomers n-butyl acrylate and crosslinker PEGDA inaqueous solution, prepared core cross-liked star-shaped polymers. In addition we usedthermosensitive P(MEA-co-the PEGA) as the linear arm, polymerized hydrophilicmonomers isopropyl acrylamide and crosslinker N,N’-methylene acrylamide byRAFT polymerization in aqueous solution, and prepared CCS polymers. And we alsostudied the impact of reaction parameters on star polymers by changing themacromolecular chain transfer agent and crosslinking agent ratio and polymerizationtime.3. We further studied the properties of the CCS polymers and star polymers labeledwith fluorescent dye as an emulsifiers, prepared stable particles template with starpolymer stabilized emulsion.