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From Shanghai to London. Asia-link program report Qin Chen & Rong Zeng. 10/09/2005 fly from Shanghai to London. VS251. Queen Mary and Westfield college, University of London. We are here. New life in the year. #86, Aston Street, London E14 7NQ. The new group and supervisor. - PowerPoint PPT Presentation
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From Shanghai to London
Asia-link program report
Qin Chen & Rong Zeng
10/09/2005 fly from Shanghai to London
VS251
Queen Mary and Westfield college, University of London
We are
here
New life in the year
#86, Aston Street, London E14 7NQ
The new group and supervisor
The lab and equipment
About our new project
All cellulose composite Make biodegradable composite from 100%
nature cellulose fiber.This composite can provide excellent
property.
Thermo sensitive chitosan hydrogels for biomaterials applications
Background information
Cellulose
☆ Most abundant (1011 t/year)
☆ High mechanical properties (ex. Crystal modulus El = 138 GPa1))
☆ Thermal stability
☆ Biodegradability
O
OH
CH2OH
O
nOH
Hydrogen bonding
Reinforcing fiber for composite
Reinforcing fiber for composite
PEEKChitin
it.PP
0
100
200
0 100 200
PET
Vectran
Cellulose I
Silk
Technora
Rodrun Ekonol
PENNylon6
Kevlar
Kevlar49Kevlar149
PE
PVA
PBZT
PBO
PEK
372
478
372 478
Al
Steel
Glass
Fig. Relationship between the crystal modulus El and the maximum specimen modulus Ymax already reported for various polymers.
Crystal modulus El (GPa)
Max
imum
spe
cim
en m
odul
us Y
max
(G
Pa)
BiomassBiomass
Kevlar
Mechanical properties
▼ Compatibility
▼ Stress transfer
Interfacial Problems
MatrixMatrix
Reinforcing fiberReinforcing fiber
Fiber Matrix
Interface
Fiber Reinforced CompositeFiber Reinforced Composite
Mechanical properties
▼ Compatibility
▼ Stress transfer
Interfacial Problems
Fiber Matrix
Interfaceless
MatrixMatrix
Self-reinforced Composite
☆ High performance
GFRP alternate
☆ Sustainable resource
☆ All biodegradable
Environmental friendly
Cellulose
All-Cellulose Composite
Ramie fiber self-reinforced Composite
Compression
Dry
Cellulose solution as Matrix
Surface dissolving
Parallel aligned Parallel aligned cellulose fiberscellulose fibers All-cellulose compositeAll-cellulose composite
OR
To dissolve natural cellulose, we follow the process: Nature fiber
Solvent exchange
LiCl(8%) dissolved in cool DMAc(N, N-
dimethylacetamide)
Immersed in distilled water, acetone, and DMAc, each for 24hrs successively. (solvent exchange) Mix
Fiber dissolved in 15hrs. And get the clear matrix (from 1% to 7%)
Methodology1% to 7% ramie fiber
concentration in 8% LiCl/DMAc Fibre alignment
Impregnation (vacuum bag), 24 hours
MethodologyGelation(24h),solvent exchange (methanol) then Room
temperature drying, 12 hours
Vacuum oven drying,at 80 C, 24 hours Final composite
Mechanical PropertiesAll Ramie Fiber Composite
Strain (%)
0 1 2 3 4 5 6 7 8
Str
ess
(M
Pa
)
0
200
400
600
800
1% Ramie Fiber Concentration in Solution (impregnation)3% Ramie Fiber Concentration in Solution (impregnation)5% Ramie Fiber Concentration in Solution (impregnation)7% Ramie Fiber Concentration in Solution (impregnation)Ramie Fiber
Mechanical Properties
All Ramie Fiber Composite
Ramie Fiber Concentration in Solution (impregnation)
1% 3% 5% 7%
Str
ess
(M
Pa
)
0
100
200
300
400
500
600
TGA Thermogram
X-Ray Diffraction Pattern
Scanning Electron Micrographs
Cross-Sectional View of Fracture Surface(80% fiber, use 1% ramie matrix)
Scanning Electron Micrographs
Cross-Sectional View of Fracture Surface(80% fiber, use 1% ramie matrix)
Scanning Electron Micrographs
Cross-Sectional View of Fracture Surface100% fiber.
Main references
Nishino, Macromolecules, Sep.2004 Anne-Laurence, Polymer 44 (2003) 4117–4126 Antje Potthast, Cellulose 9: 41–53, 2002. Chanzy, Appl Polym Symp , p 239-259 ,1983 Chanzy, J POLYM SCI POLYM PHYS ED , p 1909-1924 ,1982 Peijs, T. Materials today 2003, 6, 30. S Morris, Nanotechnology 15 (2004) 1296–1301 Elisabeth, Carbohydrate Polymers 32 (1997) 5143
……
Main references
