Journal
CHEMICAL REVIEWS
Volume 116, Issue 4, Pages 2244-2274Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemrev.5b00539
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Funding
- National Science Foundation [NSF-CHE-1309769, NSF-CHE-1058980, NSF-CHE-1508419]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1309769] Funding Source: National Science Foundation
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This review summarizes recent research on novel photochemical methods for the initiation and control of the polymerization of main chain fluorinated monomers as exemplified by vinylidene fluoride (VDF) and for the synthesis of their block copolymers. Such reactions can be carried out at ambient temperature in glass tubes using visible light. Novel, original protocols include the use of hypervalent iodide carboxylates alone or in conjunction with molecular iodine, as well as the use of photoactive transition metal carbonyls in the presence of alkyl, fluoroalkyl, and perfluoroalkyl halides. An in-depth study of the reaction parameters highlights the use of dimethyl carbonate as a preferred polymerization solvent and outlines the structure property relationship for hypervalent iodide carboxylates and halide initiators in both the free radical and iodine degenerative transfer controlled radical polymerization (IDT-CRP) of VDF. Finally, the rational selection of metal carbonyls that are successful not only as IDT mediators but, more importantly, in the quantitative activation of both PVDF-CH2-CF2-I and PVDF-CF2-CH2-I chain ends toward the synthesis of well-defined PVDF block copolymers is presented.
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