Banca de DEFESA: PAULO ROBERTO SANTOS JOSINO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULO ROBERTO SANTOS JOSINO
DATE: 29/11/2023
TIME: 14:00
LOCAL: Google meet
TITLE:

QUALIDADE DA MADEIRA DE Tachigali vulgaris L. G. Silva & H.C. Lima PARA PRODUTOS DE CELULOSE

KEY WORDS:

Biomaterials; Chemical properties; Fibers

PAGES: 68
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
SPECIALTY: Química da Madeira
SUMMARY:

The high dependence on wood from species of the Eucalyptus and Pinus genera, combined with the search for quality products, is encouraging research into alternative woods for the biomaterials industry. In this context, it is necessary to evaluate and quantify numerous characteristics that directly or indirectly influence the quality of wood to predict its correct use, such as the effects of tree bifurcation and soil types. The aim of this study was therefore to assess the effect of soil texture and stem bifurcation on the quality of Tachigali vulgaris wood. The material was collected from an experimental plantation belonging to the company Jari Celulose S.A., located in the municipality of Almeirim, in the mesoregion of the lower Amazon, Pará. Eight non-bifurcated and eight bifurcated trees were evaluated, from which disks were removed at a set position of 0% along the commercial height. The fiber morphology and chemical composition of T. vulgaris wood in soils with sandy and clayey textures and with or without bifurcations were evaluated. The results showed that the sandy-textured soils presented significant differences in fiber length, with the unbifurcated trees obtaining an average value of 690,41 μm and 614,93 μm for the bifurcated trees, in addition to this variable, the aspect ratio was higher for the unbifurcated trees. However, other quality indices for pulp and paper production were more satisfactory for the forked trees. The trees from the clay soil followed the same pattern; fiber length and aspect ratio were higher for the non-bifurcated trees, 753, 15 μm, and 60 μm, respectively. Like the trees on the sandy soil, the quality indices were more relevant for the forked trees. The chemical composition of the wood showed that the non-bifurcated trees had a lower total extractive content (6% dry mass basis - bms) than the trees on the sandy soil and (1.45% bms) than the trees on the clay soil. On the other hand, the cellulose content was higher for the forked trees, (43.96% based on extractive free mass - bml) for the trees in the sandy soil and (42.04% bml) for the trees in the clay soil. The results found in this study show that the Tachigali vulgaris species has potential for the biomaterials industry given the anatomical and chemical characteristics of the wood. However, physical and mechanical testing of the films is necessary for a better understanding

BANKING MEMBERS:
Interna - 085.946.426-10 - LAYS CAMILA MATOS - UFRA
Interna - 2410727 - LINA BUFALINO
Interno - 1134991 - THIAGO DE PAULA PROTASIO
Externa à Instituição - JULIANA LIVIAN LIMA DE ABREU - SEMAS