Dissertation > Excellent graduate degree dissertation topics show

Environmentally Friendly and Rapid Ambient Temperature Aqueous RAFT Polymerization under Visible Light Radiation

Author: ShiYi
Tutor: CaiYuanLi
School: Xiangtan University
Course: Polymer Chemistry and Physics
Keywords: Visible light-activated aqueous solution at room temperature RAFT Polymerization Quickly and efficiently Controlled activity Photoinitiator and activation Thermal activation effect
CLC: O631.5
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 0
Read: Download Dissertation

Abstract


Reversible addition fragmentation chain transfer radical polymerization (RAFT polymerization), radical polymerization and living polymerization method has the advantage of concern. Are being developed as the exact polymer synthesized by a powerful tool. Room temperature aqueous solution living radical polymerization study has important academic value and potential applications. This thesis is to explore and achieve a visible light in aqueous solution quick and efficient and active-controlled aqueous solution at room temperature RAFT polymerization. ScS S-ethyl-S '- (alpha, alpha'-di-methyl-alpha - Titanium yl) trithiocarbonate chain transfer agent (EDMAT) UV-visible absorption spectrum. ScS at 30 oC and visible light, the type of the pH of an aqueous solution EDMAT Stability Study on the visible light-activated polyethylene glycol monomethyl ether acrylate (PEGA), the monomer aqueous solution at room temperature RAFT polymerization reaction characterized by 2 - hydroxyethyl acrylate (HEA), N-(acryloyloxyethyl) pyrrolidone (NAP) and visible light activation at room temperature, an aqueous solution of RAFT polymerization ScS monomer universality of the polymerization method, and to study the thermal activation effect a visible activation at room temperature an aqueous solution of RAFT polymerization. through a cycle of optical switching process of a visible the polymerization reaction results showed that the chain transfer agent EDMAT presence of a weak absorption in the visible band, so that the visible light-activated polymerization reaction may be alkaline or neutral conditions, EDMAT hydrolysis, the hydrolysis reaction under acidic conditions was significantly inhibited. room temperature RAFT polymerization reactor having a fast and efficient and controllable active in the acidic aqueous solution, the visible light-activated Moreover, the polymerization reaction of a monomer having good universality ° F (7 ° C), low temperature polymerization reaction at room temperature (25 oC) the polymerization reaction kinetic characteristics similar to reflect the same initiator and the polymerization rate, the polymerization reaction is carried out at room temperature, the thermal activation effect can ignored. the periodically visible light switch causes quick start and termination of the polymerization reaction periodic polymerization initiator after the stop light, the polymerization reaction was terminated by the description of the system in very low concentrations of active radicals, the vast majority of the intermediate body radical form of The light again lead to a rapid polymerization process is identical with a previous lighting period, indicating that visible light significantly accelerate the cleavage reaction of the intermediate free radicals, so that the concentration of the activity of free radicals in the reaction system significantly improved the above experimental results show that , visible only to promote the TPO photolysis of the primary free radicals to initiate the polymerization reaction, but also both the function of the activation of free radical cleavage of the specificity of the optical switch control process can be used for real-time initiation and termination of the polymerization reaction.

Related Dissertations

  1. Study on SWCNT Structure Instability as Induced by In-situ Transmission Electron Microscope Electron Beam Irradiation,O482
  2. Preparation and Performance of Molecular Imprinted Polymers for Rhodamine-B and Rhodamine-6G,O631.3
  3. Urothermal Synthesis, Structure and Characterization of Functional Coordination Polymers,O631.3
  4. Synthesis and Resolution Property of N-(9-Fluorenylmethoxycarbonyl)-D-Tryptophan and D-Phenylalanine Imprinted Polymer,O631.3
  5. Synthesis and Characterization of High-performance Polyacrylonitrile,O631.3
  6. Polymerization of GMA by ATRP and Stereoregularity of PGMA,O631.3
  7. Preparation and Characteration of Composite Microspheres with Dual-, Triple- Responsive Properties,O631.3
  8. Hydrophilic structure of different types of surface -modified polyurethane material and coagulation 12 factor nine peptide fragments,and fibrinogen P1 fragment of computer simulation of the interaction,O631.3
  9. Study on Synthetic of BINOL, Amino Acid and Derivatives Molecularly Imprinted Polymers and Their Application in the Chiral Resolution,O631.3
  10. Electropolymerization and Electrochromic Properties of Conducting Polymers,O631.3
  11. Study on Carboxyl Side Groups Containing Poly Aromatic Ether Sulfone Ketone and Modification of Epoxy,O631.3
  12. Molecularly Imprinted Polymer Microspheres and Evaluation,O631.3
  13. Inorganic and inorganic - organic hybrid Zn -based catalysts and catalytic L- lactide ring-opening polymerization of L- polylactic acid applied research,O631.3
  14. Containing pyrazoline chromophore small molecule and polymer synthesis and fluorescent properties of,O631.3
  15. 1,4 - bis (4 - amino-2 - (trifluoromethyl) phenoxy ) benzene -type Schiff base imide copolymer synthesis and characterization,O631.3
  16. For drug ingredients isolated molecularly imprinted polymer microspheres preparation , properties and application of testing,O631.3
  17. Core-shell polymer microspheres synthesis, modification and application,O631.3
  18. Imprinted Polymer Preparation and application of solid-phase extraction,O631.3
  19. Syntheses, Structures and Properties of Coordination Polymers with Aromatic Dicarboxylates,O631.1
  20. Syntheses, Crystal Structures, and Adsorption Properties of Novel Tetracyanometallate-based Coordination Polymers,O631.3
  21. Syntheses, Structures and Properties of Metal-organic Coordination Polymers Based on Long-Chain Aromaticmulticarboxylate,O631.3

CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > Polymerization,polycondensation reaction
© 2012 www.DissertationTopic.Net  Mobile