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Synthesis and Modification of Cyclic Polymer

Author: XuHaiTao
Tutor: ChenHanJia
School: Shantou University
Course: Applied Chemistry
Keywords: Ring polymer Atom transfer radical polymerization Electrostatic self-assembly Controlled Radical Polymerization
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 49
Quote: 1
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Abstract


Since the ring-type macromolecular DNA was found, there is no terminal group of a ring-type polymer is an interesting research topic. Chain structural unit has a balance on the chemical and physical significance, leading to the ring polymer has a lot of special performance, polymer scientists interested. The preparation methods of the current ring-type polymer using the telechelic polymer molecules in a dilute solution under conditions within the closed-loop response. Due to the presence of the competitive reaction of the chain extender, the production process at the same time forming a linear polymer, the need to post-processing to be separated, kind generally limited to polystyrene, polybutadiene, etc. through the anionic polymerization of the obtained polymer. Due to the difficulty of the preparation of the ring polymer, less sample, a narrow range, limiting the ring polymer theory and performance studies. Therefore, the development of ring polymer has been a very urgent and challenging research topic, theoretical and practical significance. The atom transfer radical polymerization with TEMPO radical polymerization is a newly developed \In this paper, on the basis of previous studies, the use of modern polymer synthesis technology to prepare ring polymer. Chloromethyl benzoic acid initiator using ATRP Synthesis of α-carboxy-ω-chloro-linear polystyrene having a narrow molecular weight distribution and terminal functional groups, by end-group into the synthesis of α-carboxy-ω-secondary amine baseline polystyrene. Use of nitroxide radicals in the presence of controlled radical polymerization, 4,4 '- azo - bis (4 - cyano) valeric acid as initiator, 4 - hydroxypiperidine alcohol oxygen radical is a radical scavenger , the successful synthesis of the α-carboxy-ω-hydroxy polystyrene, and α-carboxy-ω-hydroxy styrene / butyl methacrylate random copolymer. Gel permeation chromatography that the concentration of the high dilution to 2 - chloro-1 - methyl iodide pyridine / triethylamine as a catalyst, α-carboxy-ω-secondary amine polystyrene, α-carboxy-ω - hydroxy polystyrene, and α-carboxy-ω-hydroxy styrene / butyl methacrylate random copolymer as the parent ring polystyrene and loop type styrene / butyl methacrylate was prepared by intramolecular cyclization ester random copolymer. The ring polystyrene benzene ring to a bit reactive chloromethyl as macroinitiator use the ATRP reaction of the novel structure of the ring polystyrene / polyacrylamide amphiphilic graft copolymer. The self-assembly is a common phenomenon exist in nature, the novel structure of the multilayer material can be prepared through molecular self-assembly. By 4,4 '- azo - bis (4 - cyano) pentanoic acid as initiator, and succeeded in synthesizing a narrow molecular weight distribution of the two-terminal carboxyl polystyrene by free radical polymerization oligomer, the use of dual-end group carboxymethyl salts of polystyrene and small molecule the mnm type hexane double end pyrrolidin quaternary ammonium salt in an aqueous solution of molecular self-assembly and covalent curing synthetic ring polystyrene, reducing the chain extension reaction between the molecules, increase into ring chance.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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