Okra Fibres-Properties and Possible Applications
Transcript of Okra Fibres-Properties and Possible Applications
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OOkra Fibres - Properties and Possible Applications
DAWID STAWSKI1, EBRU ÇALIŞKAN2,NAZİRE DENİZ YILMAZ 2
1 Lodz University of Technology Poland1. Lodz University of Technology, Poland2. Pammukale University, Turkey
5th RESET Seminar on“Eco-creativity, natural fibres, short value chains” L d 17th O t b 2017Lodz, 17th October 2017
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Introduction
Natural fibres:
Introduction
- biodegradable;biodegradable;- non toxic;- bioaceptable;bioaceptable;- mostly environmental friendly;
Do not forget disadventages.
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Weak sides of natural fibres
Problems with traditional natural fibres:
Weak sides of natural fibres
- are quite expensive;are quite expensive;- need large arable areas. This space can't be use for food cultivating;g;- using for reinforcement mean not using in clothing industry;
What can be a solution?
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Okra fibresOkra fibres
Okra fibres are coming from stem
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Okra fibres are coming from stem
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Fiber preparation –lk li ti f tialkalization for separation
- Removing of pectins, hemicelulose and other lowmolecular weight substances;I l l- Increase celulose content;
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Fiber preparation - retting
The aim of the procedure is to remove pectins and
Fiber preparation retting
p pother cellular tissues and obtain fiber separation fromthe steam.
- Water retting;- (Natural retting in stagnant or slowly moving water);- Dew retting in areas with limited water resources.
Combined action of sun, air, bacteria, dewfermentation.
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SEM images alkalized okraSEM images alkalized okra
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Courtesy dr Iwona Karbownik
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SEM images water retted okraSEM images water retted okra
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Courtesy dr Iwona Karbownik
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SEM images dew retted okraSEM images dew retted okra
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Courtesy dr Iwona Karbownik
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Linear densityLinear densityFiber Lineer Density - tex
Alkalized okra bast fiber (OA) 12.5
Water retted bottom okra bast fiber 11 9Water retted bottom okra bast fiber
(OWB)
11.9
Water retted middle okra bast fiber
(OWM)
10.3
(OWM)
Water retted upper okra bast fiber (OWU) 10.9
Dew retted bottom okra bast fiber (ODB) 17.1( )
Dew retted middle okra bast fiber (ODM) 13.1
Dew retted upper okra bast fiber (ODU) 11.2
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Breaking force and ifi t thspecific strength
Fiber Fmax cN Fmax (cN)/tex)
Alkalized okra bast fiber (OA) 407.0 64.0
Water retted bottom okra bast fiber
(OWB) 500 0 42 0(OWB) 500.0 42.0
Water retted middle okra bast fiber
(OWM) 469.8 45.8
Water retted upper okra bast fiberWater retted upper okra bast fiber
(OWU) 489.6 45.1
Dew retted bottom okra bast fiber
(ODB) 579 8 33 9(ODB) 579.8 33.9
Dew retted middle okra bast fiber
(ODM) 427.2 32.5
Dew retted upper okra bast fiber (ODU)
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Dew retted upper okra bast fiber (ODU) 414.5 37.1
Cotton: 23-36 cN/tex;Linen: 30-60 cN/tex
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Thermal analysisAlk li d k b t fibAlkalized okra bast fiber
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Nitrogen
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Thermal analysisW t tt d b tt k b t fibWater retted bottom okra bast fiber
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Nitrogen
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Thermal analysisW t tt d iddl k b t fibWater retted middle okra bast fiber
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Nitrogen
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Thermal analysisD tt d k b t fibDew retted upper okra bast fiber
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Nitrogen
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Thermal analysisA ti tiActivation energy –Coats and Redfern methodCoats a d ed e et od
Fiber Activation energy (kJ/mol)
Alkalized okra bast fiber (OA) 58.8
Water retted bottom okra bast fiber (OWB) 60.4
Water retted middle okra bast fiber (OWM) 50.9
Water retted upper okra bast fiber (OWU) 50.4Water retted upper okra bast fiber (OWU) 50.4
Dew retted bottom okra bast fiber (ODB) 42.8
Dew retted middle okra bast fiber (ODM) 54.4
Dew retted upper okra bast fiber (ODU) 62.1
17Nitrogen
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Thermal analysisA ti tiActivation energy –Van Krevelen methoda e e e et od
Fiber Activation energy (kJ/mol)
Alkalized okra bast fiber (OA) 65.8
Water retted bottom okra bast fiber (OWB) 35.7
Water retted middle okra bast fiber (OWM) 64.1
Water retted upper okra bast fiber (OWU) 63.8Water retted upper okra bast fiber (OWU) 63.8
Dew retted bottom okra bast fiber (ODB) 72.3
Dew retted middle okra bast fiber (ODM) 73.6
Dew retted upper okra bast fiber (ODU) 78.9
18Nitrogen
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Thermal analysisAlk li d k b t fibAlkalized okra bast fiber
Nitrogen Oxygen
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Thermal analysisA ti tiActivation energy –Coats and Redfern methodCoats a d ed e et od
Fiber Activation energy (kJ/mol)
Alkalized okra bast fiber (OA) 49.3
Water retted bottom okra bast fiber (OWB) 84.1 (?)
Water retted middle okra bast fiber (OWM) 69.9
Water retted upper okra bast fiber (OWU) 41.9Water retted upper okra bast fiber (OWU) 41.9
Dew retted bottom okra bast fiber (ODB) 46.7
Dew retted middle okra bast fiber (ODM) 36.4
Dew retted upper okra bast fiber (ODU) 39.3
20Oxygen
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Thermal analysisA ti tiActivation energy Coats and Redfern methodCoats and Redfern method
Fiber At ambient conditions
Activation energy (kJ/mol)
Thermooxidation
Activation energy (kJ/mol)
Alkalized okra bast fiber
(OA)
65.8 49.3
Water retted bottom okra
bast fiber (OWB)
35.7 84.1 (?)
Water retted middle okra 64.1 69.9
bast fiber (OWM)
Water retted upper okra
bast fiber (OWU)
63.8 41.9
Dew retted bottom okra
bast fiber (ODB)
72.3 46.7
Dew retted middle okra 73.6 36.4
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bast fiber (ODM)
Dew retted upper okra
bast fiber (ODU)
78.9 39.3
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Thermal analysisDSCDSC
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Courtesy dr Michał Chrzanowski
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Thermal analysisDSCDSC
23Courtesy dr Michał Chrzanowski
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UV stabilityUV stability
FiberAfter UV radiation Before UV radiation
FiberFmax cN Fmax(cN/ex) Fmax cN Fmax (cN/tex)
Alkalized okra bast
fiber (OA) 328.7 25.3 407.0 64.0
Water retted bottom
okra bast fiber (OWB) 312.0 26.2 499.8 42.0
Water retted middle
okra bast fiber (OWM) 411.6 40.2 469.8 45.8
Water retted upper
okra bast fiber (OWU) 305.7 27.9 490.0 45.1
Dew retted bottom
okra bast fiber (ODB) 406.3 23.9 579.8 33.9
Dew retted middle
okra bast fiber (ODM) 409.7 94.00 427.2 32.5
Dew retted upper
okra bast fiber (ODU) 395.7 34.0 414.5 37.1
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UV lamp, 1h
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UV stabilityUV stability
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UV lamp, 1h
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Conclusions:
- Okra fibres have good mechanical and thermalproperties;properties;
- Those properties are independent of the plant partthey come from;they come from;
- Okra fibres have quite good stability against UVradiation;radiation;
- Such type of fibres can be used as an naturalreinforcement in composites and other multipcomponent systems.
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