I tested the conductivity of the composites after changing the screw speed and time.
I found screw speed more effective and change the values by 2 order but when I change time from 5 to 10 min , nothing happened.
I will appreciated any help.
thanks
This probably means that screw speed influences the dispersion of the conductive filler, which is very logical, but that once the mixture is done at a given speed, there is no more change in the dispersion state, whatever the time.
Electrical conductivity at a given filler loading is indeed directly related to the homogeneity of the blend and to the dispersion state of the filler.
Alain
What are your conductive fillers? (particle size?)
Electrical conductivity of such system is governed by 2 factors,
- the degree of dispersion of the conductive fillers (which itself is influenced by a lot of parameters)
- the time you allow the system to form those structures which are responsible for conductivity.
These structures are described here:
https://www.researchgate.net/publication/229816762_Electrical_conductivity_in_heterogeneous_polymer_systems._V_%281%29_Further_experimental_evidence_for_a_phase_transition_at_the_critical_volume_concentration
I can explain more, if you want, if you need, but first you should digest the above publication (and you can search for more related papers in my RG site)
Article Electrical conductivity in heterogeneous polymer systems. V ...
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