Real time monitoring by time-domain NMR of ring opening metathesis copolymerization of norbornene-based red palm olein monomer with norbornene

Autor(es)

Fernandes, Henrique ^[1] ; Filgueiras, Jefferson G. ^[2] ; de Azevedo, Eduardo R. ^[2] ; Lima-Neto, Benedito S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, POB 780, BR-1366070 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, POB 369, BR-13660970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN POLYMER JOURNAL; v. 140, NOV 5 2020.
• Citações Web of Science: 0

Resumo

Changes in molecular mobility throughout the metathesis copolymerization of a norbornene functionalized with a palm olein monomer and a pure norbornene were monitored in situ by time-domain H-1 NMR, using a ruthenium catalyst. Reaction progress to produce branched palm oil-based copolymers was studied as a function of the amounts of monomers and catalyst. Transverse relaxation rates were determined from CPMG experiments and the results were in accordance with the reactivity ratios, which indicated production of gradient copolymers. Properties of the resulting material observed through TD-NMR measurements of the isolated copolymers corroborated the type of the used monomers. TD-NMR demonstrated to be a useful tool for learning copolymerization reactions, particularly in ROMP, for the first time. (AU)

• Processo FAPESP: 17/24465-3 - Métodos de RMN para caracterização de paredes celulares de plantas: desenvolvimento e aplicações para tecnologias de biocombustíveis de segunda geração
• Beneficiário: Eduardo Ribeiro de Azevedo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 17/06329-5 - Desenvolvimento de complexos de rutênio com aminas como ligantes ancilares para catálise homogênea de reações de polimerização de olefinas cíclicas via metátese
• Beneficiário: Benedito dos Santos Lima Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular