Lignosulfonate/silica hybrid nanoparticles as a novel biobased filler in polybenzoxazine matrix

CANDIA, ADRIANA; TAVERNA, MARÍA EUGENIA; FORCHETTI CASARINO, AGUSTÍN; BUSATTO, CARLOS; CASIS, NATALIA; SPONTÓN, MARISA ELISABET; LA SCALA, JOHN; ESTENOZ, DIANA

POLYMERS FOR ADVANCED TECHNOLOGIES

JOHN WILEY & SONS LTD

Año: 2024 vol. 35

1042-7147

Lignin is an abundant and sustainable resource that exhibits numerous attractivefunctional properties as a reinforcing agent for benzoxazine-based composites, dueto its stiffness, thermal stability, and high carbon content. However, the low qualityof lignin particles dispersions associated with the weak particles-matrix interactionsreduces the reinforcement capability. In this work, hybrid lignin/silica (NaLS/SiO2)nanoparticles were obtained from sodium lignosulfonate (NaLS) and tetraethylortho-silicate (TEOS) under basic conditions. The particles were characterized by transmis-sion electron microscopy (TEM) confirming their spherical morphology and narrownanometric-size distributions. The hybrid particles were incorporated into conven-tional benzoxazine (BA-a) and a difuran biobased benzoxazine (SA-dfda) to preparenanocomposites with different mass compositions (3, 5, and 10 wt%). Morphological,mechanical, dynamo-mechanical, and thermal properties of the obtained compositeswere assessed. All the materials exhibited a homogenous filler dispersion that con-tributed to improve the reinforcement properties. Hybrid nanoparticles proved to bean interesting alternative as a filler in the benzoxazine matrix to prepare high-performance thermosetting composites.