Efeito da termorretificação nas propriedades tecnológicas do bambu

• Ano de defesa: 2013
• Autor(a) principal: Brito, Flávia Maria Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Ciências Florestais; Centro de Ciências Agrárias e Engenharias; UFES; Programa de Pós-Graduação em Ciências Florestais
• Palavras-chave em Português: Thermal treatment; Dendrocalamus giganteus; Adhesives; Glued Laminate; Biological assays; Tratamento térmico; Laminado colado; Adesivos; Bambú; Madeira - Tratamento térmico; Controle de temperatura; Indústria madeireira; Recursos Florestais e Engenharia Florestal; 630
• Link de acesso: http://repositorio.ufes.br/handle/10/5002

This work aimed to evaluate the physical and anatomical characteristics of bamboo "in natura", analysing the effects of thermal treatment on the technological properties of glued laminated bamboo thermo-modified (GLBT) and in your natural durability. A total of four culms were collected in age adulthood and cut every to 2.0 m and divided into four lengthwise sections that were immersed in water for 10 days and air-dried. The sections were transformed into flights with dimensions of 0.5 x 3,5 x 45 cm (thickness x width x length) and thermal treated to 100, 140, 160, 180 and 200 °C for one hour for each temperature. T he adhesives used were “Cascophen RS-216-M”, based resorcinol – formaldehyde, “Cascamite PL-2030”,based on urea - formaldehyde, both thermoset and thermoplastic based on one polyvinylacetate, “Cascorez 2500”. The flights thermal treated were scaled according to each proposed test. It was observed that the bamboo culms have a frequency of 0 to 4 vessels.mm-2, whith mean of vessels.mm-2, with long and narrow fibres with length average of 2.72 mm. The basic specific gravity was of 0.66 g.cm-3 and volumetric shrinkage of 15.41%. The total extractives and lignin contents increased as the temperature increase, and holocellulose content has been reduced. Since the temperature of 160 °C was a gain in durability natural bamboo and the dimensional stability of GLBT adhered to RF, but there was a decrease in the values of specific gravity and mechanical properties of the material.