Cork suberin as a new source of chemicals: 2. Crystallinity, thermal and rheological properties

TitleCork suberin as a new source of chemicals: 2. Crystallinity, thermal and rheological properties
Publication TypeJournal Article
Year of Publication1998
AuthorsCordeiro, N., Belgacem N. M., Gandini A., & Neto C. P.
JournalBioresource technology
Volume63
Pagination153-158
KeywordsAlkaline methanolysis, cork of Quercus suber L., crystallinity, Density, rheological properties, suberin, thermal characterization
Abstract

Suberin samples, obtained by alkaline methanolysis from cork (Quercus suber L.), were submitted to various physical characterizations; DSC, TGA, optical microscopy, density and rheological properties. A sub- stantial proportion of these oligomers possessed a microcrystalline character with a melting range between 0 and 50°C. The amorphous part was liquid at room temperature and did not display a detectable glass transition upon cooling because of its wide molecular weight distribution. The viscous behaviour of suberin at room temperature was both plastic and thixotropic because of the structuring role of the micro- crystals