Gluability Variation of - World Bamboo Pannipa.pdf · 26.78. 25.82; 24.38. 23.40; 24.99. 24.07;...
Transcript of Gluability Variation of - World Bamboo Pannipa.pdf · 26.78. 25.82; 24.38. 23.40; 24.99. 24.07;...
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Pannipa
Chaowana
Materials Science and Engineering School of Engineering and Resources
Walailak
University, Thailand
Gluability
Variation of Dendrocalamus
asper
for Bamboo Composites
“9th
World Bamboo Congress”11 April 2012
University of Antwerp, Antwerp, Belgium
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Introduction
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Figure
Culm
characteristic of D. asper
Internode
NodeDiaphragm
2 cm25 cm
Culm-wall thickness
2 cm
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Figure
Microstructure of D. asper
Outer surface
Inner surface
Metaxylem
vessel Phloem
Parenchyma cells
Fiber cells
Fiber cells
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Outer layer
Middle layer
Inner layer
Horizontal direction Vertical direction
Figure
Variation of microstructure of bamboo culm
Top
Middle
Bottom
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Table
Variation of chemical composition of D. asper
Chemical compositions
Top Middle Bottom
Node Internode Node Internode Node Internode
Holocellulose 75.65 76.72 76.36 77.36 75.59 76.31
Alphacellulose 67.07 67.33 68.53 67.67 68.59 69.64
Lignin 30.08 26.47 30.86 27.19 30.41 27.21
Ash 2.29 1.07 1.95 0.95 1.59 0.92Alco.+Benzene
Solubility 5.55 7.44 6.67 6.18 3.75 5.85
Hot WaterSolubility 7.39 9.63 7.51 8.36 6.47 8.86
Cold Water Solubility 5.10 6.87 5.43 14.05 4.23 6.50
1% NaOHSolubility 26.78 25.82 24.38 23.40 24.99 24.07
Source: Kamthai, S. 2003. Alkaline sulfite pulping and ECF-
bleaching of sweet bamboo (Dendrocalamus
asper
Backer). M.S. Thesis, Kasetsart
University, Thailand
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Objectives
To determine the pH value and buffer capacity in each location of bamboo culms
To investigate the surface wettability through contact angle measurement
To measure the effective penetration of liquid adhesive into bamboo in different locations and surfaces of the culms.
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Materials
D. apser
culms were cut from plantation in Thailand.
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Methods and Results
pH value and buffer capacity
Bottom
Middle
Top
Bamboo powder
Soaked in distilled water and then stirred
Titrated with
0.01 N H2
SO40.01 N NaOH
Record the pH change after acid or alkaline addition
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Figure
The initial pH value of D. asper
in relation to the culm
location
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Figure
The pH changes of D. asper, in relation to the culm
location, during the acid and alkaline addition.
0.01 N H2 SO4 (ml) 0.01 N NaOH (ml)
2550
Acid addition
Alkaline addition
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Wettability
Bottom
Middle
Top
Outer surface
Inner surface
Culm
wall surface
Bamboo
Distilled water
Measure the contact angle after drop the distilled
water on bamboo surface
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Figure
Average value of contact angle of D. asper, separated by culm
location and surface
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Adhesive penetration
Bottom
Middle
Top
Outer surface
Inner surface
Culm
wall surface
Image and measure the average adhesive penetration into bamboo surface
Bamboo
UF adhesive layer
X1 X2 X3
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Figure
Average value of adhesive penetration on the surface of D. asper, separated by culm
location and surface
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Conclusions
The pH value of D. asper
is on acid side. It does not vary
along the location of the culm.
Buffer capacity of D. asper
is more stable toward alkaline
rather than acid. There are slightly differences in the values along the culm
location.
Wettability
of D. asper
decreases from the bottom to the top
part of the culm. Furthermore, wettability
of bamboo culm outer surface is found to be lower than inner part.
The adhesive penetration of D. asper
at different culm
location and surface is signification different from one other. The penetration also decreases from the bottom to the top part of the culm. Moreover, the penetration on culm
inner surface is
greater than that of outer and the culm
wall surface.
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Further forecasts
The appropriate layer structure for production of
Laminated Bamboo Lumber and Plybamboo
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Figure
The possibility of layered structure on laminated bamboo lumber and plybamboo
manufacture
Type 1 Type 2 Type 2
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The further study of the density varitaion
of bamboo strand that influence on physical and mechanical properties of Oriented Strand Board and Oriented Strand Lumber
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Acknowledgements
School of Engineering and Resources, Walialk
University, Thailand
Wood Science and Engineering Research Unit, Walilak
University
Dynea
Krabi, Co., Ltd
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Thank you for your attention
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