I guess you mean thermal conductivity ? It will strongly depends on the density of the mat. The data will be accurate provided that the density is suitably controlled and that the measured sample is big enough for neglecting the inhomogeneities. I would suggest a steasy-state method using a lambda-meter.

Alain

dear Ana,

you have not mention which type of conductivity you want to measure. if it is electrical conductivity you can used four probe method. 

Four probe is the apt method for finding electrical conductivity [DC] . Also , the measurement parameters depends on which polymer system you use .... like conducting polymer / non conducting polymer with conductive fillers............ you can also try with impedance measurements to get AC conductivity..........

If you want to measure electrical conductivity, yes it is possible. You can use a standard four-probe configuration to get a value of electrical resistance (it is simpler if you place the two inner probes at a distance of 1 cm, so you get directly the resistance per unit length). Once you have the resistance per unit length, you can evaluate the conductivity by calculating the conductive cross-section of your fibre.

Article Organic electronics on natural cotton fibres

1. See you please = Electrical Transport in Solids, With Particular Reference to Organic Semiconductors (International Series in the Science of the Solid States) Hardcover – February 1, 1981 by K. C. Kao (Author), W. Hwang (Author);

2. http://literature.cdn.keysight.com/litweb/pdf/5989-2785EN.pdf = we have it, maybe  for you will be suitable... But !!! Is it more important task - to understand: а) what and how you need to measure (which conductivity), b) sample preparation (especially contacts).

.... 3. The work on half an hour  = ;) :)

Thank you!

Yes, I want to measure electrical conductivity of polyaramid fibres.

My plan was to use a four probe system. The main problem for me is how to get good and reliable contacts for the measurement.

@ Ana - In general , Aramid systems were non conductive , you can improvise the electrical conductivity only by adding conductive fillers [metal NP,CNTs, Graphene Oxide] in polymer solution before electrospinning . Even after addition of fillers some system may not have good conductivity since the fibers will be non aligned [ there wont be any problem if u cast your polymer as thin film and you can get smooth surface with fine contact for measurements ] ... so you should get aligned fibers of your system with highly conductive fillers and which may allow the current in the range of micro/nano amps........ all the best 

I guessed you wanted to measure thermal conductivity because polymer fibres are electrically insulating ...

Very difficult to measure, with extremely low pseudo-currents and time-dependent effects.

Alain

Good afternoon, Ana,

How can I understand there You don't need to clarify the nature of the conductivity in your fibers. You want to understand the differences between some fibers from the other (of their own kind)

... By the way, you have a polyamide or polyaramide fiber? But perhaps now it is not very important  :)

...

To ensure the flow of experimental data is necessary to make a device for routine work. If you want a very simple - it means, so be it! :)

0! == (It is very important...)  Morally be ready to make a device of high quality from the fact that comes handy!  I'm not kidding ... :) Something will have to break, but when you're done you will not regret it :) 

So...

1 == You can not break the PTFE vial if you have just a Teflon sheet or tube (the second - it is better)... For best results, you will need a half pipe ... This pipe should be cut in half - along the axis. If there is a list - then you can simply bend... But you can expect instability forms... Size will go... And this is not desirable...

2 == I very much hope that we will be able to find the wire in your lab, and you do not have to straighten paper clips with pliers :) ... Although, so many of them and they are always on the table... of chief :)

3 == Now we need to make a slit in the edges of the trough (which we did from the vial) ... a total of 4 slits with one and 4 from the other side. 

4 == In these slits necessary to push a wire (or a straightened paper clips :)) The result should be a 4 wire bridge over the trough. It would be better if the wire to bend a little and clamp the edges of the vial (again using the pliers). The bridge must be rigid and strong, and keep in shape when polyamide fibres will be placed over them. (Little nuance: internal 2 "bridges" make you a little higher)

5 == Now connect the power supply (external contacts or "Bridge") and an ammeter or voltmeter to the internal contacts.

6 == The final touch: Put on gloves at last! And wash and device in isopropanol, chloroform, or other degreasers (if you have ultrasonic bath, use it)!

7 == Remarks == If the measurements will be unstable - write me, I will try to answer why and how to make that increase repeatability!

PS: ... may be patenting a device? A? :)

The problem of measurement will be in separation of surface conductivity and bulk conductivity. For polymer dielectrics the one is compared with the other. Difference between them could be obtained, E.G., by using of fibers with several diameters. Similar problem was solved in the paper  (J. Phys. D: Appl. Phys. 38 (2005) 915–921 "Surface conductivity at the interface between ceramics and transformer oil" S M Korobeynikov, A V Melekhov, Yu G Soloveitchik,M E Royak, D P Agoris and E Pyrgioti)

Or even if you can cut your fibres into small discs, and put them on a plane substrate you can characterize them by imaging ellipsometry (lateral resulotion down to 1 micron, you get the dielectric function out of a spectroscopic measurment.

Best regards

Christian