Caracterização e fraccionamento da casca de Quercus serris para separação da cortiça tendo em vista a sua utilização em aglomerados

• Author(s): Ali Umut Sen
• Date: 2012
• Persistent ID: http://hdl.handle.net/10400.5/5206
• Origin: Repositório da UTL
• Subject(s): Quercus serris; cork; chemical composition; heat treatment; adsorption
• Document Type: Doctoral thesis
• Language: Portuguese
• Advisor(s): Pereira, Helena Margarida Nunes; Miranda, Isabel Maria Sanches
• Contributor(s): Repositório da Universidade de Lisboa

Description

Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia

Quercus cerris bark was studied with the following objectives: i) to study bark anatomy, ii) to separate and determine chemical composition of cork, iii) to analyze the thermal behavior of cork, iv) to investigate the use of cork as adsorbent of pollutants in aqueous environments and v) to compare the results obtained with those from Quercus suber. The bark of Q. cerris is composed of phloem, periderm and rhytidome. The rhytidome contains various sequential periderms with large portions of cork and many sclerified tissues. The cork structure is similar to that of Q. suber, but the cells are smaller and have higher solid fraction. The chemical composition of cork of Q. cerris is similar to that of Q. suber but suberin content is less and it is formed largely by ω-hidroxyacids. The thermal degradation starts at 200°C and increases with temperature and treatment time. Suberin was thermically more resistant. The colour was altered until 40% of mass loss. A mass loss model was developed with colour change values.