Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 54, Issue -, Pages 296-301Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2014.01.027
Keywords
Cork; Suberin; Liquefaction; Glycerol; Polyethylene glycol
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Funding
- Slovenian Research Agency [L4-2144, P40015]
- Slovene Human Resources Development and Scholarship Fund [11013-6/2011-4]
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The aim of this study was to develop polymers in a liquid solution, from renewable bio-resources, usable as intermediate materials in the preparation of plastics, adhesives or coatings. The liquefaction of cork with glycerol was investigated at 150 degrees C, 180 degrees C, and 200 degrees C under acidic (sulphuric acid) or alkaline conditions (sodium hydroxide). Cork appears as a two-component material, containing suberin and lignocelluloses. In the presence of sulphuric acid, only the liquefaction of the lignocellulosic components was achieved, leading to liquefaction yield of less than 47% at all investigated conditions. The inverse phenomenon was observed with sodium hydroxide. Suberin was almost completely liquefied, but an increase of temperature and/or sodium hydroxide content was necessary to improve the liquefaction of lignocelluloses. Addition of polyethylene glycol to glycerol to a certain extent caused the conversion of suberin under acid conditions leading to liquefaction yield up to 93%. Therefore, it was demonstrated that it is possible to use cork dust, a less valuable by-product, for the production of various basic chemicals and/or polymers with a high added value. (C) 2014 Elsevier B.V. All rights reserved.
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