Lignosulfonate/silica hybrid nanoparticles as a novel biobased filler in polybenzoxazine matrix |
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Authors: | Adriana Candia María Eugenia Taverna Agustín Forchetti Casarino Carlos Busatto Natalia Casis Marisa Elisabet Spontón John La Scala Diana Estenoz |
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Affiliation: | 1. Grupo de Polímeros y Reactores de Polimerización, Instituto de Desarrollo Tecnológico para la Industria Química (UNL-CONICET), Santa Fe, Argentina;2. U.S. Army Combat Capabilities Development Command's Army Research Laboratory, Aberdeen, Maryland, USA |
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Abstract: | Lignin is an abundant and sustainable resource that exhibits numerous attractive functional properties as a reinforcing agent for benzoxazine-based composites, due to its stiffness, thermal stability, and high carbon content. However, the low quality of lignin particles dispersions associated with the weak particles-matrix interactions reduces the reinforcement capability. In this work, hybrid lignin/silica (NaLS/SiO2) nanoparticles were obtained from sodium lignosulfonate (NaLS) and tetraethylorthosilicate (TEOS) under basic conditions. The particles were characterized by transmission electron microscopy (TEM) confirming their spherical morphology and narrow nanometric-size distributions. The hybrid particles were incorporated into conventional benzoxazine (BA-a) and a difuran biobased benzoxazine (SA-dfda) to prepare nanocomposites with different mass compositions (3, 5, and 10 wt%). Morphological, mechanical, dynamo-mechanical, and thermal properties of the obtained composites were assessed. All the materials exhibited a homogenous filler dispersion that contributed to improve the reinforcement properties. Hybrid nanoparticles proved to be an interesting alternative as a filler in the benzoxazine matrix to prepare high-performance thermosetting composites. |
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Keywords: | composite materials lignin/silica nanoparticles mechanical properties polybenzoxazine |
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