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TRANSCRIPT
Large scale nanofibrillated cellulose films:
an overview on its production, properties and
potential applications
Maria Soledad Peresin
CEPI AND EFPRO OPEN SEMINAR
“NEW IDEAS FOR THE PAPER INDUSTRY – YOUNG RESEARCHERS PRESENTATIONS”
Nov. 27th 2013
ForestTech
VTT Technical Research Centre of Finland
2 08/11/2013
Outline
Introduction to nanocellulose
Film preparation method
Properties of NFC films
Conclusions
3 08/11/2013
Cellulosic fiber
Acid hydrolysis
Cellulose nanocrystals
Enzymatic treatment
or
Mechanical Shearing
Nano/microfibrillated cellulose
Adapted from Pääkkö, et al. Biomacromolecules (2007) 8 p.1934
Nanocellulose manufacture methods
4 08/11/2013
Nanofibrillated cellulose
Nano-
Microfibrillated cellulose
Masuko
Super
Masscolloider
Microfluidics
Fluidizer
Processor M-700
Natural
cellulosic fiber
5 08/11/2013
Nanocellulose Research Strategy @ VTT
Wood Bacteria Straw Sugar Beet Banana
Safety and sustainability
Technologically
feasible
6 08/11/2013
From properties to applications
NFC Properties
• Abundant, natural
nanomaterials
• Renewable, biodegradable &
biocompatible
• High strength & modulus
• High thermal stability
• Lightweight
• Optical transparency
• High water binding capability
• High aspect ratios & high
surface area
• Opportunities for chemical
modification (surface OH)
NFC Potential
applications
• Composites
• Electronics
• Sensors
• Construction
• Paper & Pulp
• Filtration
• Coatings & surfaces
• Health care
• Rheology modifiers
• Aerogels
• Packaging
• Etc…
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Preparation of NFC films
Traditional method
Pressurized filtering
Several hours dewatering time
Filter and membrane marking
Developed method
R2R NFC films
NFC coated evenly on plastic film
Controlled spreading, adhesion
and drying
No shrinkage
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Preparation of R2R NFC films Surface treatment concept (SutCo)
SUBSTRATE
PRE-TREATMENT
COATING of NFC
on SUBSTRATE
(PRE-TREATMENT
of NFC)
CONTROLLED
DRYING
DETACHING from
SUBSTRATE
PRESSING of
NFC FILM
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SutCo line
Single modules connected as desired
Roll coating operated as 2- or 3-roll configuration
Spray or curtain coating
Air drying units (5 pieces)
UV/Plasma/Coron unit
Offline calender
•Velocity range 3…90 m/min
•Substrate grammages 40…300 g/m2
•Coating weight 0.1…400 g/m2
•Viscosities min. 1…15 000 mPas
•Online moisture and coating amount monitoring
•Online web surface temp. monitoring
•Coatings: water, alcohol, acetone and toluene based, pH 4…10
•Coating width: adjustable between 200…500 mm
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NFC film roughness
0
200
400
600
800
1000
Aver
age
roughnes
s(n
m)
Plastic substrate NFC bottom side NFC top side
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NFC film properties
• Fast drying during manufacture
• Excellent print quality
• No print through (20 µm films)
• Translucent
• Transparent using simple chemistry
• Printed to desired locations
• Water tolerant
• Excellent barrier properties
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.
Water tolerance of modified NFC film
0 10 20 30 40 50 60
0
20
40
60
80
100
Conta
ct angle
(degre
es)
Time (seconds)
Ref_UV
Silyl_UV
0 10 20 30 40 50 60
0
20
40
60
80
100
Co
nta
ct a
ng
le (
de
gre
es)
Time (seconds)
Ref_UV
Silyl_UV
Untreated NFC film
Modified NFC film
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Nanocellulose films as barrier materials
Oxygen permeability of surface
modified nanocellulose film
Tammelin, T. and Vartiainen, J., NFC Films and Barriers. In: Handbook of Green Materials; Processing Technologies, Properties and Applications. Vol 3. Self- and
directed assembling of Bionanomaterials. Oksman, K., (Ed.), under revision. M.S. Peresin, J. Vartiainen, V. Kunnari, T. Kaljunen, T. Tammelin and P. Qvintus, in the 4th
International Conference on Pulping, Papermaking and Biotechnology (ICPPB'12) (Nanjing, China, 2012), pp. 891-895. M. Österberg, J. Vartiainen, U. Hippi, J. Seppälä
and J. Laine, ACS Applied Materials & Interfaces, under revision. T. Hirvikorpi, M. Vähä-Nissi, J. Nikkola, A. Harlin and M. Karppinen, Surf. Coat. Technol. 2012, 205,
5088.
Good oxygen barrier
materials
Sensitive towards moisture
and water
Emphasis on improvement of
the water sensitivity of the
nanocellulose films
Surface modification of the
films
Inorganic thin layers
deposited on nanocellulose
film using ALD
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Thinking forward…
NFC film
applications
Flexible and OLED
displays
Flexible circuits,
printable electronics,
conductive substrates
Flexible solar panels
(Smart) packaging
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Conclusions
• Upscalable R2R process for NFC films
• High quality NFC film
• Promising properties
• Film surface modification (chemical and physical):
new applications
• Flexible small scale piloting offers countless
opportunities to turn ideas into products
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Thank you all for your kind atention!
Maria Soledad Peresin