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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/4300

Title: Study of thermochemical treatments of cork in the 150-400ºC range using colour analysis and FTIR spectroscopy
Authors: Sen, Ali
Marques, António Velez
Gominho, Jorge
Pereira, Helena
Keywords: Quercus cerris
cork
heat treatment
colour analysis
FTIR
Issue Date: 2012
Publisher: Elsevier
Citation: "Industrial Crops and Products". ISSN 0926-6690. 38 (2012) 132-138
Abstract: A study of chemical transformations of cork during heat treatments was made using colour variation and FTIR analysis. The cork enriched fractions from Quercus cerris bark were subjected to isothermal heating in the temperature range 150–400 ◦C and treatment time from 5 to 90 min. Mass loss ranged from 3% (90 min at 150 ◦C) to 71% (60 min at 350 ◦C). FTIR showed that hemicelluloses were thermally degraded first while suberin remained as the most heat resistant component. The change of CIE-Lab parameters was rapid for low intensity treatments where no significant mass loss occurred (at 150 ◦C L* decreased from the initial 51.5 to 37.3 after 20 min). The decrease in all colour parameters continued with temperature until they remained substantially constant with over 40% mass loss. Modelling of the thermally induced mass loss could be made using colour analysis. This is applicable to monitoring the production of heat expanded insulation agglomerates.
Description: Available at SciVerse ScienceDirect
Peer Reviewed: yes
URI: http://hdl.handle.net/10400.5/4300
ISSN: 0926-6690
Publisher version: www.elsevier.com/locate/indcrop
Appears in Collections:DRAT - Artigos de Revistas

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