Autoria: PROTZEK, G. R.; MAGALHAES, W. L. E.; BITTENCOURT, P. R. S.; CLARO NETO, S.; VILLANOVA, R. L.; AZEVEDO, E. C.

Resumo: The use of araucaria pine nut shell in polymer composites may increase the pine nut value and help protec araucaria (Araucaria angustifolia) itself, which is an endangered species. The aim of this work is to study the influence of the size of pine nut shell fiber on the mechanical properties of composites made of this shell and polyurethane derived from castor oil. Composites with different polyurethane contents were manufactured with dried untreated pine nut shell sieved through 30 and 50 mesh sieves (0.6 and 0.3 mm, respectively). Composites were shaped by mechanical mixing of the components followed by hot pressing. Properties such as density, water absorption, and flexural strength were measured. Specimens were also characterized by SEM, FTIR, and TGA. The flexural strength of PU/0.3mm pine nut shell composites with 30% PU (wt%) was 57.7 MPa, and their water absorption was 7.37% after 24 hours of immersion

Ano de publicação: 2019

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Florestas

Palavras-chave: Araucaria pine nut shell, Casca de pinhão, Castor oil, Composite, Compósito, Mechanical properties, Poliuretano, Polyurethanes