Imagine nano 2013-1

DC-Reactive Magnetron Sputtering_tech

_tech | _consulting | _legal 1/21

Electrically conductive polypropylene fibers

[email protected]


He2Sock


He2SockElectrically conductive polypropylenene fibers

ImagineNano 2013 Bilbao April 23rd 2013

DC-Reactive Magnetron Sputtering_tech Cold weather warfare


ImagineNano 2013 Bilbao April 23rd 2013

DC-Reactive Magnetron Sputtering_tech Current cold weather warfare


Operating in multiple cold weather climates such as in Afghanistan

In the last 70 yearsEvolution in ergonomics and materials

DC-Reactive Magnetron Sputtering_techThermal protection

Passive thermal management (up to -40 °C)

Multi-layering systems

ECWCS: (up to -51 °C)

(Generation III ExtendedCold WeatherClothing)

PCU: US Special forces (up to -43 °C)

(Protective Combact Uniform)


Active thermal management (below -40 °C)

MCPS: Aviator and aircrew protection

(Multi-Climate protection System)

(Protective Combact Uniform)

Electrical Resistive Heating

(C Thwaites, W. L. Gore et al, Cold weather clothing , Military textiles 2008, page 178)


ECWCS: (up to -51 °C)

(Generation III ExtendedCold WeatherClothing)


http://www.drum.army.mil/mountaineer/Article.aspx?ID=2008

http://www.nationalguard.mil/news/archives/2006/12/121406-weather_gear.aspx



When the body starts to feel cold, the blood flow of the extremeties is reducedto keep te core temperature (vital organs) protected.




Electrical Resistive Heating: Footwear, gloves and headgear

-Investigated since WW2, especially for aircrew (Siple 1949). Research has continued since them (House et al 2003)


- There is no insulated glove that keep hands warm when sitting at – 40 ºC formore than about 2 hours. Heating is the only solution to achieve longer duration. (Eugene Wilusz, Military textiles 2008)

-Control and thermoregulation must be well managed. Overheating the feet can upset the thermoregulation of the whole body. (Burton 1963)

WW2 RAF heated inner boots and gloves Department of Defense of India


http://www.hammacher.com/publish/71850.asp?promo=apparel

http://www.diytrade.com/china/pd/2805033/Heated_Sock.html

http://healiohealth.com/products/index/2621


New flexible, light weight and high conductive materials needed


He2Sock Leadera: Development of new heating, healing textiles


MATERIALS


Development of electrically conductive fibers

Metallic fibers: Expensive, more brittle and heavier than most textilefibers, making it difficult to produce homogenous blends and also they cansuffer galvanic corrosion.

Non-metallic conductive coatings : Can suffer from delamination which


Non-metallic conductive coatings : Can suffer from delamination whichclearly affects the electrical conductivity.

Intrinsically conductive fibers have a major advantage compare with theconductive fibers based on coated yarns because the former can not sufferfrom delamination,



MATERIALS


Development of electrically conductive polypropylen e MWCNT fibers and tapes:

PP, and TPU composites based with electrical conductivities of up to:

- 50 S/m (8% wt MWCNT)

- 2000 S/m (40% wt MWCNT)

- Percolation and thresholds at 0.5% wt.


Extensive characterization:SEM, XRD, MFI, DSC, etc


New compounding method assisted by ultrasonication:

Combining our know how in nanodipersions withspray dryer techniques can reduce the process costto 0.04 €/g

Already scaled up to Kg/batch



CompositeprocessPristine CNT

SolidNanocomposite


Nanocomposite(powder)

4 times streched

6 times streched

Fiber Spinning


110 (α)

040(α)

130(α) 111(α)

CNT-PP composites tapes (6 times streched)


CNT allignement by SEM.

20 30 40 50

2 Φ

060(α)220(α)

Polymer chains alignment by XRD.

Mechanical test for fiber reinforcement are ongoing. Improved compositefibers compatible with other materials such as UHMWPE


The lack of a 3D interconnected conductive network can also explain thedecrease in the electrical conductivity of these composites in tapes 6 timesstretched compared to the 4 times stretched tapes or disks.

MWCNT(% wt )

Conductivity (S/m)(disk)

Conductivity (S/m)

(tape x4 streched)

Conductivity (S/m)

(tape x6 streched)

Table 1


streched) streched)

5 20 10 -8 70 50 -

4 times stretched is enough for fiber spinning


New materials willrepresent:

FlexibleLightweightNon corrosion



Future developments of our materials. Other matrices are envisaged:

High conductive thermoplastic fibers


Thermoplastic

conducting

materials

IR absorbant materialImproved mechanical properties

Alternative to Ghost® from Texplorer(metalized material)


Thank you for your attention

Asociación de la Industria NavarraNavarra (Spain)

MATERIALS


Francisco Martín, PhDR&D Department

[email protected], [email protected]

Technology

Imagine nano 2013-1