Development of a bio-based adhesive from Protium heptaphyllum resin

Abstract

In this work, a bio-based adhesive is prepared from Protium heptaphyllum resin. The resin is first characterized by 1 H and 13 C nuclear magnetic resonance spectroscopy and the bioadhesive is then prepared using a simple mixture of the resin with linseed oil, catalyzed by cobalt octanoate, to induce crosslinking. The precursors and bioadhesive obtained are characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). The NMR analysis shows the presence of groups of triterpenes, such as α-and β-amyrins, and diols, such as brein and maniladiol. Thermogravimetric analysis reveals that the resin has less thermal stability than the bioadhesive. Mechanical tests indicate that the bioadhesive has greater adhesion strength compared to the commercial adhesive, reaching an average stress at break of 7.66 and 0.113 MPa for the wood and carbon steel substrates, respectively. In conclusion, the bioadhesive can be used for the production of composites.

Avaliação do potencial de produção de látex de duas espécies exóticas no Semiárido Paraibano: Cryptostegia madagascariensis Bojer ex Decne e Plumeria alba L.

“…A grande vantagem do uso de biopolímeros biodegradáveis, está relacionada a possibilidade de reduzir a poluição ambiental, pois após sua vida útil, estes compostos degradam-se e transformam-se novamente em biomassa, sem efeitos prejudiciais ao meio ambiente (MARCZAK et al, 2020;CHAN et al, 2019). Nesse contexto, muitas pesquisas foram desenvolvidas buscando materiais de natureza orgânica cujas propriedades possam substituir no todo ou em parte o uso de substâncias poluidoras, como os adesivos verdes, por exemplo (MARCZAK et al, 2020;ALMEIDA et al, 2021;CHAN et al, 2019;JUITA et al,. 2011).…”