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Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
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Ming-Zhu Pan
Veröffentlicht/Copyright:
14. Februar 2008
Abstract
Wheat straw fibre is prepared by a thermomechanical (TM) refining system. This study investigated the effects of refining steam pressure (4, 6, 8 and 10 bar) and refiner speed (2500 and 3000 rpm) on the morphology and thermal properties of the resulting fibres. After TM refining, the fibres exhibited more surface irregularities and heterogeneities as well as decreased fibre length. The fine content decreased with increasing steam pressure, but the aspect ratio increased. The findings show that higher steam pressure (8 bar) results in more effective wheat straw refining. Refining lowers the pH. Thermogravimetric analysis showed that TM refining does not influence the thermal properties of wheat straw fibres. Weight loss has to be taken into account upon exposure to temperatures around 170°C. The silica content of the fibres was significantly reduced through refining.
Keywords: fibre morphology; pH; silica content; thermal stability; thermomechanical refining; wheat straw fibre
Received: 2007-10-2
Accepted: 2008-1-3
Published Online: 2008-02-14
Published Online: 2008-02-14
Published in Print: 2008-05-01
©2008 by Walter de Gruyter Berlin New York
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Schlagwörter für diesen Artikel
fibre morphology;
pH;
silica content;
thermal stability;
thermomechanical refining;
wheat straw fibre
Artikel in diesem Heft
- Meetings
- Original Papers
- Topochemical investigation on tension wood fibres of Acer spp., Fagus sylvatica L. and Quercus robur L.
- Developing environmentally benign and effective organic wood preservatives by understanding the biocidal and non-biocidal properties of extractives in naturally durable heartwood
- Assessment of biodeterioration for the screening of new wood preservatives: Calculation of stiffness loss in rapid decay testing
- Degradation of thermo-hygro-mechanically (THM)-densified wood by soft-rot fungi
- FT-NIR spectroscopy in predicting the decay resistance related characteristics of solid Scots pine (Pinus sylvestris L.) heartwood
- Effects of fixation temperature and environment on copper speciation in ACQ treated red pine
- Fixation of copper(II)-protein formulation in wood: Part 1. Influence of tannic acid on fixation of copper in wood
- Fixation of copper-protein formulation in wood: Part 2. Molecular mechanism of fixation of copper(II) in cellulose, lignin and wood studied by EPR
- 1-Alkoxymethyl-X-dimethylaminopyridinium-base ionic liquids in wood preservation
- Short Note
- Synthesis and evaluation of phosphortriamidates in wood for thermal and fungal decay protection
- Original Papers
- 3D magnetic resonance microscopy of a wounded beech branch
- Sorption of corn cob and oat spelt arabinoxylan onto softwood kraft pulp
- Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
- Extractive composition and summative chemical analysis of thermally treated eucalypt wood
- Analysis of cell wall swelling on the basis of a cylindrical model
- Swelling of larch wood in organic liquids
- Determination of the thermal conductivity of wood by the hot plate method: The influence of morphological properties of fir wood (Abies alba Mill.) to the contact thermal resistance
- Short Note
- Study of the retarding mechanism of citric acid during gypsum particleboard manufacturing
- Obituary
- William Edwin (Ted) Hillis (1921–2008)
