Professor at Technical University of Liberec, Czech Reublic. D.Sc.
Jiří Militký Department of Textile Materials, Textile Faculty, Technical University of Liberec...
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![Page 1: Jiří Militký Department of Textile Materials, Textile Faculty, Technical University of Liberec Materials for Intelligent Textiles ITSAPT Seminar Portugal.](https://reader036.fdocuments.in/reader036/viewer/2022081506/56649de55503460f94adcb53/html5/thumbnails/1.jpg)
Jiří MilitkýDepartment of Textile
Materials, Textile Faculty,
Technical University of Liberec
Materials for Intelligent Textiles
ITSAPT Seminar Portugal November 2005
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Textiles and mankind
Textile products are accompanying humans during their whole life
Apparel – number of humans
(5-10 kg per year)Technical – dependent on
the state of knowledge
Apparel
T ec hnic al
Cons um ption kg/ rok10
Sal
ary
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HighTech. vs HighTex.High Tech High TexRaw materials PropertiesProduction PerformanceControl DesignFinishing FunctionsAdds on(Productivity, (New functions,energy improved propertiesecology) deterioration of
properties
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Apparel Textiles
Fashion Comfort Protection Information Sport
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Technical textiles
Medical textiles Geo textiles Textiles for
transport Composites Protective textiles Textile electronics Etc.
World technical textiles consumption
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Automotive textiles
The automotive industry is the largest user of technical textiles, which about
20 kg in each car of the 45 million or so cars made every year world wide. 3.5 kg seat covers4.5 kg carpets6 kg other interior textiles6 kg composite (glass fibre)10 m2 upholstery fabrics8.5 m2 trim items (including floor covering)
Foam textile interfaces
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Main aimIntegration of the results of the recent development of material engineering, technology and chemistry or physics for
the purposes of the creation of new textile structures with special properties suitable for the production
“intelligent” apparel textiles technical textiles with specified
properties.
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Smart structures
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Intelligence
Artificial intelligence – intelligent = able to create decision on the base of external stimuli (sensorial, mechanical, chemical etc.).
Intelligent structures – intelligence = ability of positive reaction to external stimuli.
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Stimulus / ResponseStimulus (change) SElectromagnetic energy (UV, visible, IR radiation)Chemical energy (moisture, presence of ions, etc.)Mechanical energy (pressure, break, twist, atd.)
Response (change..) RShape (swelling, shrinking)Colour (shade, intensity)Electrical conductivityState of matter (phase change, crystallinity etc.)
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Materials for smart structures
Nano materials are not included here
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Innovative textiles “Intelligent” body adaptive response apparel textiles having
improved comfort controlled by the state of microclimate and wearers needs.
“Intelligent”-knowledge based technical textiles with specified properties (e.g. locally compressive behaviour) and complex actions (comfort type mattresses for disabled persons, intelligent car seats etc.)
Hybrid multifunctional textiles for protective clothing combining improved protection (a barrier against the selected types of radiation and particles) with improved comfort.
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Intelligent textiles
Sensitive to external
fields (ph, radiation,
electric, magnetic,
mechanical fields). PASIVE Changing properties
(usually form) as
response to external field changes
ACTIVE
diabetes
oxidation reduction
electrochromic
photochromic
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Active intelligent textiles
Shape memory (reversible form changes
due to heating and cooling)
Heat storing and evolvingmaterials
Variable porosity and water vapor permeability
DV
P B
TM
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Stimuli Sensitive Materials
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pH sensitive materials Polyeletrolytic
gels
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Thermo sensitive materials
Lower Critical Solution
Temperature
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IPN with termosensitive materials
A – coils are swollen hydrophilic or collapsed hydrophobic
B – coils are swollen hydrophilic independently on temperature
T low T high
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PNIPAAmPoly N-izopropylakrylamid and copolymers
Soluble in water below 32oC precipitation above 32oC.
Transition helix coil
Trends in Biotechnology 20, 305 (2002)
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PNIPAAm properties Stimuli: temperature,
ionic strength, pH, light, electric and magnetic field
Response: shape, surface, sol-gel transition, solubility
Sol-gel: near IR, magnetic field, colour change- red shift (lower wavelength)
Application: bio-medicine, control dosing, sensors
Poly N-izopropylakrylamid on cotton
below 32oC hydrophilic above 32oC hydrophobic
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PNIPAAm response
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Porosity control
Porosity control via amount of grafted material
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Cyclodextrines - basic Polysacharides built
from six to eight D glucose units
Torus shaped with hydrophobic cavities
Formation during enzymatic degradation of starch
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Cyclodextrines trap
Cyklodextrines Molecular traps „Wacker Specialites“
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Cyclodextrines anchoring
Permanent fixationCellulose fibres – triazinyl groupsPES fibres – log alkyl chainsPA fibres – sulfonic acid groups
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Cyclodextrines applications
Sweat removal, odor absorption
PerfumesDetergents –
defoamingDyeing surfactants (fastness, solubility)Antibacterial finishingEffluents treatment
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Specialty polymers
The integration of macrocycles to polymers (bifunctional linkers epichlorhydrine)
Dendrimers highly branched with selective traps andcages
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Biomimetics –development
1960 Jack Steele - bionics as science dealing with systems copying some functions from nature.
1972 Breslow - biomimetic chemistry combination of bio
and mimetic (imitation). 1987 Pederson a Cram - Nobel prize
in chemistry (synthesis of ether rings for creation of artificial enzymes and cell membranes)
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Biomimetics• Kelvin mirror galvanometer - analogy with sun rays
reflected from his monocle• Georges de Mestral Velcro zipper – analogy with
special seed entagled to hid dog hackles. • Leonardo da Vinci flying machines – analogy with bird
flight
Obr.5
Obr.3
Obr.1
LOTUS effect
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Specialty Materials Aerogels Piezoelectric
layers and fibers Nano composites Chameleonic
fibers Conductive
textiles
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Textile fibers
Fibrous structure due to orientation of macromolecules along fiber axis and partial crystallization, (3D arrangement.
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Extremely high relative surface area
Relative surface area Sp [m2 g-1] is surface area of fiber divided by corresponding mass. For circular fibers (radius r) is
**4
*2
*****2
2 Trlrlr
S p 10
-310
-210
-110
010
110
210
-2
10-1
100
101
102
103
104
polomer vlakna [mikrometr]
Povr
chov
a pl
ocha
[m2/
g]
Konvencni vlakna
Mikrovlakna Nano vlakna
Uhlik 1800kg/m3
Nylon 1140 kg/m3
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Shape variation Cross section
shape Hollow fibers Variable fineness
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Spider silk
Spinning from aqueous solution of polypeptides at room temperature.
Solidification on the air. Fibers are resistant
against weather and are durable.
Fibers are biodegradable and reusable.
Tenacity = 1,75 GPa Compressive strength =
0,05 GPa
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High functional fibers New polymers Additives and dopes
(conductive fibres) Surface geometry
changes Controlled degradation
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Deep grooved fibersProperties
Spontaneous wicking
Dust trap
Large surface area
Better coverage
Voluminosity
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Deep grooves
Dust trap Anchoring of carbon particles (odour absorption)
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Fibrous bioreactors
Maintenance of live bacteria in fibres during sufficient time.
Textiles removing oils and smudge, generating therapeutic agents.
E. Coli and plasmid GFP-5 creating green fluorescent protein (GFP).
f iber
valve
vacuum pump
solution
VPI System
trap vacuum chamber
gauge
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Surface Changes
Metallisation „Mtex“ Controlled electro
polymerisation PANI Polymer brushesHydrophility changes molecular forest Coating - Caffeine, sea algae extract,
Activation of enzymes destroying fats. Fibres „wonder slim“ FUJI
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Self Cleaning Effect
Nano particles of TiO2 (anatase) Photocatalytic effect
due to UV radiation Oxygen and hydroxyl
free radicals - very active on small scale and in small time
Antibacterial, self cleaning
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Textile products Complicated
hierarchical structure
Cohesive secondary bonds
Fractal surface Macro, micro and
nano porosity
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Specialty yarns
Microclimate Quick sweat
removal
Hollow yarns
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Special nonwovens
• Quasi-yarn is formed by twisting of fibre ends, which are protruding from the surface of textile material; •Twisting body moves on the surface of a textile fabric.
Hm
a
laminatingreinforcing
Textile 1Textile 2
Rotating body
Product
Obr.:16
1
3
2
corrugated
H
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Auxetic structuresAuxetic(enlarged).NegativePoisson ratio
During the tensile deformation are extended laterally as well
o
oT
S
SS
allongitudin
shrinkinglateral T where
extension
*)21()1(*)*1( 2 oV
V
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Auxetic structures II
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Auxetic materials
Auxetic yarnPAD/cotton
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Auxetic polymers
During the tensile deformation are extended laterally as well
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Auxetic structures in medicine
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Shape memory alloys
NiTiNOL- shape memory is due to phase changes in solid state.
H
H
A
Mc o o ling
heating
eMeA
d efo rm atio n
load
T m k T ak
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Shape memory polymers
Recovery to original straight form
Proc. Natl. Acad. Sci. USA, 98, 842 (2001).
Super elastic glasses
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PUR membrane DiAPLEX
Air permeability is increasing due to body temperature increasing
Below Tg is
membrane non porous. Water from body is removed due to diffusion.
N o n p er m eab le
T r an s it io n
P erm eab le
Per
mea
bili
ty
lo w
h ig h
T em p er a tu r e- 3 0 0 C 4 0 0C
0 0 C
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Physiological comfort
breathable Thermal insulation Ventilation No liquid sweat
on skin
Non permeability for water – drop diameter 100 μm Permeability for water vapour – molecule diameter 0.4 μm
dry
wet1940 Ventile –fabricLong staple cotton combed yarns Oxford weave 2 ply yarn in warp RAF
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Thermalcomfort
Intensity of movement External conditions
1litreO2/min = 20kJ/min75-80% energy is heat1 litre evaporated water = 2.4MJ
Middle endurance 1 litre oxygen per min 960 kJ heat per hourSufficient is to evaporate 400 ml sweat.
High endurance 4 litres oxygen per min 3600 kJ heat per hourEvaporation oft 1500 ml potu. Limit
Thermal losses are increasing with square power of air velocity
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Improved comfort Transport of water
vapors Non permeability for
liquid water Air exchange Thermal insulation
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Thermal effects Heat evolved by phase change
m mass, latent heat L [kJ/kg] boiled water 2256 Heat evolved by heating
Specific heat c [J/(kg K)] water 4190 Heat evolved by conduction
LVLmQ ***
TcVTcmQ *****
[W/(m K)] thermal conductivity: air 0.026 water 0.68 skin 0.09 PES 0.2 Ag 428, A area, t time, h thickness
h
TA
t
Q *
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Heat energy storing Temperature sensitive materials. Water
from 1 C to 99 C. Increasing temperature (1 C), absorption of heat 4,18 J/g.
(fiber EKS Toyobo cross linked polyacrylate).
Phase change materials Storing and releasing of heat as a result of phase changes (solid –liquid ). Short time effect., PEG has latent heat of phase change L = 121 J/g
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Heat storing- Outlast Encapsulation of
liquid crystalline materials
PCM phase changing materials
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Time to phase change Encapsulated (PEG) have no influence to heat transfer.
Their volume ratio is vf ,density Hm=1500 kg m-3 and latent heat of phase change is L=121 J g-1
Capsules are dispersed in PET matrix of thickness h=1 mm and thermal conductivity = 0,2 W m-1K-1
Temperature difference between inner and outer layer is dT= 5K
For vf =0.3 is result t = 54.4 s.
dT
LHvhst mf
*
***][
2
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Active cooling Space suits – active cooling by
circulation of water in pipesD´Appolonia adopted this system for apparel applications.
PCS- Personal cooling system CSIRO. Heat transfer via thermal exchange tube (exchanger based on cooling by evaporation).
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Thermal insulation
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Active thermal adaptation Shape memory (reversible form
changes due to heating and cooling)
Variable porosity and water vapor permeability
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SSM membranesSensitive to temperature
changesLow temperature
High temperature
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Passive intelligence
Special kind of passive intelligent structures are parts of wearable electronics and wearable computers
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Wearable electronics I
Spots on the body for including electronic parts.(designer view)
ANBRE (analogue biomechanical recorder)
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Wearable electronics II
Music jacket
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Textile switches
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Textile keyboards Conductive net
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Pressure sensors Soft switch
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Inteligent shirt Electronic devices Heart rate Breathing Body temperature Electrocardiogram Voice Weave with optical
fibers net
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Computers development
Past times
Today reality
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Wearable computers
1. Parts on the body and cloth
Inteligent shirts
2. Intuitive interface Speech and movement
recognition
3. Visual communication Transparent Display
4. New sensations (IR sonar)5. Proactive (ready to work
immediately)
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Textile computer MIT
washable flexible
MIT ‚Textile computer
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Computer comfort
Hard computers
hard
stiff
thick
Textile computers
soft
flexible
thin
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