High-performance acetosolv lignin-incorporated DGEBA cured with aprotic imidazolium-based ionic liquid: Polymerization, chemical, thermal and combustion aspects of the thermosetting materials

Vinícius Taveira Andrade Felipe; Jéssica Fernandes Marques; Mauro Ricardo da Silva Silveira; Carlos Arthur Ferreira; Selma Elaine Mazzetto; Diego Lomonaco; Francisco Avelino

doi:10.1016/j.ijbiomac.2023.124863

High-performance acetosolv lignin-incorporated DGEBA cured with aprotic imidazolium-based ionic liquid: Polymerization, chemical, thermal and combustion aspects of the thermosetting materials

Int J Biol Macromol. 2023 Jul 1;242(Pt 2):124863. doi: 10.1016/j.ijbiomac.2023.124863. Epub 2023 May 16.

Authors

Vinícius Taveira Andrade Felipe¹, Jéssica Fernandes Marques², Mauro Ricardo da Silva Silveira², Carlos Arthur Ferreira², Selma Elaine Mazzetto³, Diego Lomonaco³, Francisco Avelino⁴

Affiliations

¹ Departament of Research, Extension and Production, Federal Institute of Education, Science and Technology of Ceará, 63503-790 Iguatu, CE, Brazil.
² LAPOL/PPGEM, Federal University of Rio Grande do Sul, BP 15010, 91501-970 Porto Alegre, RS, Brazil.
³ Departament of Organic and Inorganic Chemistry, Federal University of Ceará, 60440-900 Fortaleza, CE, Brazil.
⁴ Departament of Research, Extension and Production, Federal Institute of Education, Science and Technology of Ceará, 63503-790 Iguatu, CE, Brazil. Electronic address: francisco.avelino@ifce.edu.br.

PMID: 37201891
DOI: 10.1016/j.ijbiomac.2023.124863

Abstract

The lignin valorization constitutes a chemical platform for several segments of chemical industry. The aim of this work was to evaluate the potential of acetosolv coconut fiber lignin (ACFL) as an additive to DGEBA, curing it using an aprotic IL ([BMIM][PF₆]) and analyze the properties of the obtained thermosetting materials. ACFL was obtained by mixing coconut fiber with 90 % acetic acid and 2 % HCl at 110 °C during 1 h. ACFL was characterized by FTIR, TGA and ¹H NMR. The formulations were fabricated by mixing DGEBA and ACFL at different concentrations (0-50 % wt.). The curing parameters and [BMIM][PF₆] concentrations were optimized by DSC analyses. The cured ACFL-incorporated epoxy resins were characterized by gel content (GC), TGA, MCC and chemical resistance in different media. ACFL undergone a selective partial acetylation that favored its miscibility with DGEBA. High GC values were obtained at high curing temperatures and ACFL concentration. The crescent ACFL concentration did not affect the T_onset of the thermosetting materials significantly. ACFL has increased the resistance of DGEBA to combustion and different chemical media. ACFL has shown a great potential to be used as a bio-additive for enhancing the chemical, thermal and combustion properties of high-performance materials.

Keywords: Bio-additive; Coconut fiber; Ionic liquid; Lignin valorization.

MeSH terms

Allergens
Chemical Phenomena
Ionic Liquids*
Lignin* / chemistry
Polymerization

Substances

Lignin
2,2-bis(4-glycidyloxyphenyl)propane
Ionic Liquids
Allergens