Organocatalyzed beta-pinene polymerization in UV light: Assessment of reaction conditions and material characterization

Autor(es)

Rodrigues, Plinio R. ^[1] ; Goncalves, Sayeny A. ^[1] ; Vieira, Ronierik P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Bioproc & Mat Engn, Sch Chem Engn, Albert Einstein Av, BR-13083852 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN POLYMER JOURNAL; v. 147, MAR 15 2021.
• Citações Web of Science: 0

Resumo

beta-pinene constitutes an emerging alternative for functional bio-based polymer production. Considering the diverse range of polymerization strategies, controlled organocatalyzed photopolymerization stands out as an environmentally friendly option that may be conducted without solvents and initiated by an alkyl halide under light radiation. In the present work, for the first time, the bulk photopolymerization of beta-pinene biomass under UV light was evaluated using different initiators and organocatalysts. A comprehensive structural investigation (FTIR, H-1 NMR, and C-13 NMR), a thermal scanning (TGA), and the polymer antioxidant activity were also assessed. Monomer conversion was markedly influenced by the catalyst concentration and reached a maximum value of 39.31% (8-h reaction time). The molar masses of the materials produced were low, Mn below 1200 g mol(-1). However, polymer dispersity varied from 1.06 to 1.54, indicating a substantial reaction control in most conditions tested. Kinetic evaluation of beta-pinene best-controlled polymerization, regarding the dispersity values, showed limitations in polymer chain growth, indicating the occurrence of catalyst termination, which was also confirmed by structural analysis. The synthesized polymer presented an initial degradation temperature superior to 200 degrees C and noticeable antioxidant activity compared to the monomer. Therefore, future applications of this material in polymer blends could be very beneficial to produce packagings and coatings with higher antioxidant activities. (AU)

• Processo FAPESP: 18/02508-5 - Síntese de poli(limoneno) via O-ATRP: uma proposta de aumento da massa molar e ausência de resíduos metálicos na produção de um polímero de fonte renovável
• Beneficiário: Roniérik Pioli Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Regular