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Caracterização e fraccionamento da casca de Quercus serris para separação da cortiça tendo em vista a sua utilização em aglomerados
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Orientador(es)
Resumo(s)
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.
Descrição
Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
Palavras-chave
Quercus serris cork chemical composition heat treatment adsorption
Contexto Educativo
Citação
Ali Umut Sen - Caracterização e fraccionamento da casca de Quercus serris para a separação da cortiça tendo em vista a sua utilização em aglomerados. Lisboa: ISA, 2012