Visible light-induced radical polymerization of vinyl acetate mediated by organo-nickel N2O2 Schiff-base complexes

Registro completo de metadados
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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Federal de Uberlândia (UFU)-
Autor(es): dc.creatorPesqueira, Naralyne M.-
Autor(es): dc.creatorBignardi, Camila-
Autor(es): dc.creatorOliveira, Larissa F.-
Autor(es): dc.creatorMachado, Antonio E.H.-
Autor(es): dc.creatorCarvalho-Jr, Valdemiro P.-
Autor(es): dc.creatorGoi, Beatriz E.-
Data de aceite: dc.date.accessioned2025-08-21T15:52:47Z-
Data de disponibilização: dc.date.available2025-08-21T15:52:47Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jphotochem.2022.114443-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/246386-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/246386-
Descrição: dc.descriptionFour nickel(II) complexes with symmetrically substituted N2O2 tetradentate Schiff-base ligands, prepared from the 2:1 condensation of 3-tert-butyl-salicylaldehyde, and ethylenediamine (1), o-phenylenediamine (2), 1,2-cis,trans-cyclohexyldiamine (3), or 1,3-diaminepropane (4), were synthesized. These NiII Schiff-base complexes (1–4) were used as control agents for the polymerization of vinyl acetate (VAc) photoinitiated by diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) according to a photoinduced organometallic-mediated radical polymerization (photo-OMRP) mechanism. All complexes presented good control ability, although the polymerization mediated by 3 showed the best control over molecular weight (Mn matching Mn,th) and dispersity (Ð < 1.50). The livingness of the polymers has been confirmed by LED on and LED off experiments, the polymerization stopped immediately, and no monomer conversion was observed during the light-off period, indicating a negligible concentration of the active radical in the dark. Further, to demonstrate the living nature of this system, block copolymers of poly(vinyl acetate)-b-poly(methyl acrylate) were synthesized using the sequential visible-light-induced process. Kinetic results and computational investigations supported the activation/deactivation equilibrium exerted by complexes 1–4, which occurred on only one face of the complexes via reversible deactivation (RD) mechanism.-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia UNESP – Univ. Estadual Paulista, SP-
Descrição: dc.descriptionInstituto de Química Universidade Federal de Uberlândia, P.O. Box 593, Minas Gerais-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia UNESP – Univ. Estadual Paulista, SP-
Idioma: dc.languageen-
Relação: dc.relationJournal of Photochemistry and Photobiology A: Chemistry-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCopolymer-
Palavras-chave: dc.subjectLED irradiation-
Palavras-chave: dc.subjectPhoto-OMRP-
Palavras-chave: dc.subjectRadical polymerization-
Título: dc.titleVisible light-induced radical polymerization of vinyl acetate mediated by organo-nickel N2O2 Schiff-base complexes-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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