Data/hora: 20/06/2024 16:32:19

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 13/11/2019
Data da última atualização: | 28/05/2020
Autoria: | LOUREÇON, T. V.; SANTILLI, B. V.; MAGALHAES, W. L. E.; BOLZON DE MUNIZ, G. I.
Afiliação: | Tainise V. Lourençon, Aalto University; Beatriz V. Santilli, Universidade Federal do A,azonhas; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Graciela I. Bolzon de Muniz, UFPR.
Título: | Thermal stabilization of wood/polypropylene composites through addition of unmodified, low-cost Kraft lignin.
Ano de publicação: | 2020
Fonte/Imprenta: | Waste and Biomass Valorization, v. 11, n. 4, p. 1555-1563, Apr. 2020.
DOI: | 10.1007/s12649-018-0484-6
Idioma: | Inglês
Conteúdo: | Wood/polymer composites are elegant strategies to produce materials with good performance and reduced cost. However, the addition of a lignocellulosic fiber is often responsible for the decreased thermal stability, decreasing their appeal as building materials. Here, we aimed to improve the thermal stability of wood/polypropylene composites through addition of unmodified, low-cost, abundant, ready-to-use kraft lignin. Besides thermal behavior, the composites were analyzed concerning to water relationships, colorimetric parameters, mechanical properties, and morphological features. The wood/propylene composites with and without lignin showed a very similar morphology with good interaction between matrix and biomasses. Thickness swelling decreased as function of lignin increment. The composites with 4, 12 and 20 wt% of lignin content had temperatures at 10% mass loss shifted toward higher temperatures (332, 350 and 362 °C, respectively) compared to wood/ polypropylene (326 °C). Flexural strength of wood/propylene composite was preserved (42 MPa) at 4 wt% of lignin addition and tensile strength was kept unaltered in all ratios of lignin/wood (14?19 MPa).
Palavras-Chave: | Bio-based polymer; Compósito; Kraft lignin; Lignocellulosic; Polímero de base biológica; Propriedade térmica; Water absorption.
Thesagro: | Absorção de Água; Lignina.
Thesaurus Nal: | Thermal properties.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (57073-1) - UPC - AP - DD -  -  -  - DIS