For a semicrystalline polymer in DC conductivity, the electrical resistivity increased with increasing temperature until Tg and decreased after that temperature?
Dear Dr. Morsi,
The nature of transport phenomena in polymers above or under Tg is quite different.
In the first case segmental mobilty is "frosen" and side pendant groups work only but above one in rubber state the segmental mobility promotes diffusion and conductivity.
To answer on your question more correctly, we have to know the type of the polymer and hence the mechanism of conductivity (ionic, electronic..). I can only assume that at T
Dear colleague Mohamed Abd El-Moniem Morsi,
Al Salamo alicom wa rahmato Allah wa barakatoh.
Have a nice time and good day.
Concerning your interesting question, at temperature lower than glass transition temperature[Tg], structural relaxation may be has an effect on the materials [O. Shpotyuk, B. Bureau, V. Boyko, A. Ingram, R. Golovchake, C. Roiland, J. Non-Cryst. Solids 392–393 (2014) 1., A. El-Denglawey, M.M. Makhlouf, M. Dongol, J. Non-Cryst. Solids 449 (2016) 34–40]. Such this issue may affect the other properties; structural optical and electrical properties. Electrical properties can be improved by improving structural properties and according to the applied temperature the conductivity may be intrinsic or extrinsic.. So XRD is needed to be done before and after Tg to identify the existed phase and the ordering effect consequently the crystallite size, strain,…etc. SEM, TEM and AFM can be used to confirm the obtained results.
I wish that this is useful and help you.
Yours
A. El-Denglawey
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