Journal ArticleDOI
Controlled Radical Polymerization by Degenerative Transfer - Effect of the Structure of the Transfer Agent
TLDR
In this article, various transfer agents of the type R-I were explored, and 1-phenylethyl iodide, iodoacetonitrile, and iodoform were found to be effective in controlling molecular weights and for providing polymers with relatively low polydispersities.Abstract:
Control of the radical polymerization of styrene and acrylates has been achieved by using alkyl iodides in a degenerative transfer process. Various transfer agents of the type R-I were explored. Of those examined, 1-phenylethyl iodide, iodoacetonitrile, and iodoform were found to be effective in controlling molecular weights and for providing polymers with relatively low polydispersities, M w /M n ≤ 1.5. Relatively good control has been also achieved with perfluoroalkyl iodides, whereas most alkyl and aryl iodides have been ineffective transfer agents. Also explored were the effects of initiator structure and reaction temperature on the polymerization systems.read more
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Journal ArticleDOI
Controlling the degree of branching in vinyl polymerization
Ashootosh V. Ambade,Anil Kumar +1 more
TL;DR: In this article, two different approaches, namely, Self-Condensing Vinyl Polymerization (SCVP) and Atom Transfer Radical Polymerisation (ATRP), were developed for controlling the degree of branching in vinyl systems, and a review article highlights recent advances in the science and technology in these two industrially very important approaches.
Journal ArticleDOI
Living-Free-Radical Emulsion Photopolymerization of Methyl Methacrylate by a Surface Active Iniferter (Suriniferter)
TL;DR: A surface active RAFT agent as a suriniferter, composed of the dithiobenzoyl main structure and a benzoic hydrophobic carboxylate hydrophilic moiety, was synthesized and applied to the living-radical emulsion polymerization of methyl methacrylate (MMA) initiated by UV irradiation in the absence of added surfactant and additional initiator at various temperatures as mentioned in this paper.
Journal ArticleDOI
Solvent Effects on the Intramolecular Charge Transfer Character of N,N-Diaryl Dihydrophenazine Catalysts for Organocatalyzed Atom Transfer Radical Polymerization.
Matthew D. Ryan,Jordan C. Theriot,Chern-Hooi Lim,Haishen Yang,Andrew G. Lockwood,Nathaniel G. Garrison,Sarah R. Lincoln,Charles B. Musgrave,Garret M. Miyake +8 more
TL;DR: This study confirms the importance of CT character in the excited state for N,N-diaryl dihydrophenazine PCs, and a deeper understanding of the activity of CT PCs has enabled the synthesis of polymers of low dispersity in a controlled fashion.
Journal ArticleDOI
Synthesis of Polyolefin Block and Graft Copolymers
TL;DR: Despite the commercial success of polyolefins, the lack of reactive groups has limited many of their end uses, particularly when the interaction with other material is important as discussed by the authors, which is the case of polyamide.
Journal ArticleDOI
Nitroxide-mediated photo-living radical polymerization of vinyl acetate
TL;DR: In this paper, the photoradical polymerization of vinyl acetate was performed using 4methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl (MTEMPO) as the mediator in the presence of bis(alkylphenyl)iodonium hexafluorophosphate (BAI).