Adding value to lignins isolated from sugarcane bagasse and Miscanthus

C. G. da Silva (1) , Stéphane Grelier (2, 3) , Frédérique Ham-Pichavant (2, 3) , Elisabete Frollini (1) , Alain Castellan (2, 3)

1 Univ Sao Paulo - Inst Quim Sao Carlos
2 LCPO - Laboratoire de Chimie des Polymères Organiques
3 Team 2 LCPO : Biopolymers & Bio-sourced Polymers

Attempt to depolymerize industrial organosolv lignin (from sugarcane bagasse) and lignins extracted from sugarcane bagasse and Miscanthus fibers (isolated by a soda/anthraquinone process) in presence of an anthraquinone acid catalyst (AQCOOH) was described. With the aim to substitute formaldehyde by glutaraldehyde, a dialdehyde that can be obtained from natural sources, lignins were reacted with glutaraldehyde and studied as phenolic-type resins for thermosets. The reactions were predominantly analyzed be SEC and P-31 NMR spectrometry. The Organosolv lignin-glutaraldehyde resin was used to prepare a composite reinforced with sugarcane bagasse fibers. Control samples were also prepared; specifically, composites based on phenol-formaldehyde and organosolv lignin-formaldehyde matrices. The results of the impact and the flexural strength tests of these composites showed that the organosolv lignin and glutaraldehyde can successfully replace phenol and formaldehyde, respectively.

Mots clés: Sugarcane bagasse; Miscanthus; Organosolv lignin; Depolymerization; Anthraquinone; Lignophenolic resin; Composites

Domaines: Polymères

C. G. da Silva, Stéphane Grelier, Frédérique Ham-Pichavant, Elisabete Frollini, Alain Castellan. Adding value to lignins isolated from sugarcane bagasse and Miscanthus. Industrial Crops and Products, 2013, 42, pp.87-95. ⟨10.1016/j.indcrop.2012.04.040⟩. ⟨hal-00932349⟩