Atom transfer radical polymerization by [RuCl2(PPh3)(2)(amine)] catalysts: Cyclic amines as tuner of reactivity

Autor(es)

Cruz, Thais R. ^[1] ; Borim, Patricia ^{[2, 1]} ; Goi, Beatriz E. ^[1] ; Silva Sa, Jose L. ^[3] ; Lima-Neto, Benedito S. ^[2] ; Carvalho, Jr., Valdemiro P. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Fac Cincias & Tecnol, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Estadual Piaui, Ctr Ciencias Nat, BR-64002150 Teresina, PI - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF POLYMER RESEARCH; v. 24, n. 11 OCT 28 2017.
• Citações Web of Science: 0

Resumo

Atom transfer radical polymerizations (ATRP) of styrene (St) and methyl methacrylate (MMA) mediated by {[}RuCl2(PPh3)(2)(amine)] complexes, with amine = pyrrolidine (1), piperidine (2), or perhydroazepine (3), were investigated as a function of time, temperature, and concentrations of monomers and 2-bromoisobutyrate as initiator. The plots of ln({[}M](0)/{[}M]) vs. time and molecular weights vs. monomer conversion were linear and the dispersity indexes decreased with increasing monomer conversions. The complexes 1, 2, and 3 were able to mediate the polymerizations with acceptable rate and level of control. Differences in the rate and control of polymerization were observed in the order 3 > 2 > 1 for both monomers. The activities were discussed considering the steric hindrance and electronic characteristics of the amines as ancillary ligands in the metal centres, considering studies by cyclic voltammetry and NMR. (AU)

• Processo FAPESP: 13/10002-0 - Desenvolvimento de complexos de rutênio como sistemas catalíticos duais na polimerização simultânea ROMP/ATRP
• Beneficiário: Valdemiro Pereira de Carvalho Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores