2 edition of synthesis and use of cobalt complexes in catalytic chain transfer polymerisation found in the catalog.
synthesis and use of cobalt complexes in catalytic chain transfer polymerisation
Jennifer Louise Waterson
Thesis (Ph.D.) - University of Warwick, 2000.
|Statement||Jennifer Louise Waterson.|
|The Physical Object|
|Number of Pages||232|
Catalytic radical polymerization of vinyl monomers by cobalt porphyrin complex and metamorphosis of block-into-block copolymer Article in Polymer 42(6) March with 15 Reads. Cobalt-based catalysts attract special interests as the microstructure of the product, including cis-1,4-PBD and syndiotactic 1,2-PBD, depending on the structure of the ligand coordinated to central a result, a variety of cobalt complexes have been designed and exploited for cis-1,4 and 1,2-selected polymerization, such as the cobalt halides and carboxylates, or the combination of Cited by: 9.
The synthesized polymeric Pd complexes perform the photosynthesized activation of dioxygen to the lowest excited singlet state, which is an active oxidizing agent for anthracene producing the 1,4-addition products. The monomeric and macromolecular cobalt complexes are chain-transfer catalysts in radical styrene by: 7. The method involves adding a catalytic chain transfer agent to the reaction mixture of the monomer and the radical initiator. Catalytic chain transfer proceeds via hydrogen atom transfer from the organic growing polymeryl radical to cobalt(II), producing a polymer vinyl-end group and a cobalt-hydride species (equilibrium 2).
Synthesis of macromonomers via catalytic chain transfer (CCT) polymerization and their characterization via NMR spectroscopy and electrospray ionization mass spectrometry (ESI-MS)Cited by: All the complexes activated by ethylaluminum sesquichloride (EASC) were evaluated in 1,3-butadiene polymerization. The catalytic activity and selectivity were significantly influenced by the ligand structure and central metal. Comparing with the nickel complexes, the cobalt complexes exhibited higher catalytic activity and cis-1, by: 9.
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Waterson, Jennifer Louise () The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation. PhD thesis, University of by: 1.
The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation Author: Waterson, Jennifer Louise ISNI: (CCTA’s) and their effect and implications on catalytic chain transfer polymerisation (CCTP).
CCTP is an effective polymerisation technique for producing low molecular weight methacrylate and Cited by: 1. Organo-cobalt complexes have demonstrated unique properties in the mediation of radical polymerizations such as catalytic chain transfer polymerization (CCTP) of methacrylates and reversible deactivation radical polymerization (RDRP) of unconjugated monomers particularly vinyl acetate.
This article describes the use of cobalt‐mediated catalytic chain transfer in aqueous solution under fed conditions for the preparation of macromonomers of acidic, hydroxy, and zwitterionic functional monomers. Use of a batch reaction leads to hydrolysis of catalyst, a mixture of mechanisms and poor control of the by: A catalytic chain-transfer agent based on cobalt phthalocyanine has been used in the free radical polymerization of acrylamide in aqueous acetic acid.
The resulting product is an oligomeric poly. Cobalt(II) phenoxy‐imine complexes in radical polymerization of vinyl acetate: The interplay of catalytic chain transfer and controlled/living radical polymerization.
Journal of Polymer Science58 (1), DOI: /polCited by: The full text of this article hosted at is unavailable due to technical difficulties. The molecules started getting larger as his interests turned toward elastomeric polypropylene, catalytic chain transfer in free-free-radical radical polymerizations, and most recently ethylene polymerization with polar comonomers.
He has over publications and patents and a book Cited by: This chapter discusses cobalt-catalyzed catalytic chain transfer polymerization (CCTP). The use of Co(II) macrocycles as catalytic chain transfer (CCT) agents in free radical polymerization is a. Abstract: Catalytic chain transfer polymerisation of methyl methacrylate has been investigated by a range of cobalt(I1) complexes.
The effect of catalyst structure, reaction temperature and solvent has been examined. At 60°C in the absence of solvent, the chain transfer coefficient, Cs, for MMA and cobaloximes modified by.
An overview is given of cobalt-catalyzed chain transfer in free-radical polymerization and the chemistry and applications of its derived tic chain transfer polymerization is a very efficient and versatile technique for the synthesis of functional macromonomers. Firstly the mechanism and kinetic aspects of the process are briefly discussed in solution/bulk and in emulsion Cited by: The reversible bond formation between cobalt(II) catalytic chain transfer agents and propagating radicals was studied using electron paramagnetic resonance and conventional kinetic measurements.
It was found that this reversible cobalt−carbon bond formation has no significant effect on the catalytic chain transfer polymerization of methyl methacrylate but does affect the polymerization Cited by: The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation.
Author: Waterson, Jennifer Louise. ISNI: Awarding Body: University of Warwick Current Institution: University of Warwick Date of Award: The best recognized chain transfer catalysts are low spin cobalt(II) complexes and organo-cobalt(III) species, which function as latent storage sites for organo-radicals required to obtain living radical polymerization by several pathways.
The major products of catalytic chain transfer polymerization are vinyl terminated polymer chains. Introduction.
The solution polymerization of 1,3-butadiene (BD) for the production of high cis-polybutadiene rubber (BR), is a commercial process and being practiced world-wide with cobalt- nickel- and neodymium-based catalytic systems. During the course of polymerization process, with most of coordination catalysts, controlling the molecular weight (M.W.) of the polymers is a major Cited by: Synthesis of 3-[tris(trimethylsilyloxy)silyl]propyl methacrylate macromers using catalytic chain transfer polymerization: A kinetic and mechanistic study.
A novel approach was demonstrated for the synthesis of hyperbranched polymers by direct free radical polymerization of divinyl monomers controlled by a cobalt chain transfer catalyst (1). By controlling the competition between propagation and chain transfer with 1, the free radical polymerization of ethylene glycol dimethacrylate (3) afforded soluble hyperbranched polymers in one pot.
The Cited by: Abstract: Organo-cobalt complexes have demonstrated unique properties in the mediation of radical polymerizations such as catalytic chain transfer polymerization (CCTP) of methacrylates and reversible deactivation radical polymerization (RDRP) of unconjugated Cited by: 3.
Poli et al. expanded this area by developing a new cobalt complex, CoII(OPN) 2 [Scheme 1(b)], to mediate the catalytic chain transfer polymerization (CCTP) of vinyl acetate (VAc) More details of recent progress in CCTP could be found in the review article published by Heuts and Smeets In addition to catalytic CCTP, cobalt complexes have Author: Yi‐Hao Chen, Shih‐Ji Chen, Jia‐Qi Li, Zhenqiang Wu, Gene‐Hsiang Lee, Yi‐Hung Liu, Wei‐Ting Cheng, Ch.
Cobalt(II) phenoxy‐imine complexes in radical polymerization of vinyl acetate: The interplay of catalytic chain transfer and controlled/living radical polymerization Yi‐Hao Chen Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, TaiwanAuthor: Yi‐Hao Chen, Shih‐Ji Chen, Jia‐Qi Li, Zhenqiang Wu, Gene‐Hsiang Lee, Yi‐Hung Liu, Wei‐Ting Cheng, Ch.
Besides, cobalt phenoxy‐imine complexes were found to mediate the polymerization of vinyl acetate via catalytic chain transfer or controlled/living radical polymerization pathways depending on.In summary, depending on the propensity of the polymer to undergo hydrogen elimination and the ability of cobalt complex to promote H-abstraction, either “catalytic chain transfer polymerization” (CCTP) or “cobalt mediated radical polymerization” (CMRP) is favored, as emphasized in Fig.
6. 3. Cobalt-mediated radical polymerization Cited by: Controllable synthesis of nanosilica surface-grafted PMMA macromonomers via catalytic chain transfer polymerization CCTP of methacrylates derivatives using cobalt complexes has been now well-established as a powerful J.P.A.
Heuts, K. MoodyA novel route to the preparation of aldehyde end-functionalised oligomers via catalytic chain Cited by: