Manufacture of fibrous reinforcements for biodegradable biocomposites from Citysus scoparius
| Autor: | Juan Carlos Parajó, António M. Cunha, Valentín Santos, Daniel González, Ana Rita Campos |
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| Rok vydání: | 2010 |
| Předmět: |
Absorption of water
Materials science General Chemical Engineering 02 engineering and technology 01 natural sciences Inorganic Chemistry chemistry.chemical_compound Hydrolysis Polylactic acid Lignin Hemicellulose Cellulose Waste Management and Disposal 010405 organic chemistry Renewable Energy Sustainability and the Environment Organic Chemistry 021001 nanoscience & nanotechnology Pollution Xylan 0104 chemical sciences Fuel Technology chemistry Chemical engineering Biocomposite 0210 nano-technology Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 86:575-583 |
| ISSN: | 0268-2575 |
| DOI: | 10.1002/jctb.2555 |
| Popis: | BACKGROUND:Cytisus scoparius samples were processed with hot, compressed water (autohydrolysis treatments) to obtain both fiber-containing solids (suitable as reinforcements for composites) and a liquid phase containing sugar oligomers derived from hemicelluloses. The solid phase from autohydrolysis, mainly made up of cellulose and lignin, was employed for manufacturing polylactic acid (PLA)-based biodegradable composites. The mechanical properties, water uptake and thermal properties of composites were assessed. RESULTS: The hydrolysis of the major hemicellulose polysaccharide components of Cytisus scoparius was interpreted using kinetic models based on sequential pseudo-homogeneous first-order, irreversible reactions. Operating under non-isothermal conditions, the autohydrolysis experiment carried out at up to 215 °C led to the maximum concentration of sugar oligomers (accounting for about 71% of the initial xylan). These compounds can be employed for a variety of purposes, including applications as prebiotics. Composites containing autohydrolyzed fibers presented both improved impact strength and reduced water absorption ability. CONCLUSIONS: Autohydrolysis of Cytisus scoparius led to a liquid phase containing xylooligosacharides with commercial value, and to a solid phase suitable as a reinforcement for PLA-based composites with reduced water retention ability. Copyright © 2010 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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