Dear Researcher,
Can I request for your help about finding rheological properties-like relaxation time- of some polymers. Do you know valid and reliable reference(s) in this field?
I would like to suggest you to follow Dr. A. K. Lele's, (Scientist at CSIR-NCL, Pune) articles. He has pioneering work in the filed of Rheology of various systems.
Determination of relaxation time, dielctricity, segmnetal motion etc could be effectively studied using impedance spectra.
Study of Rheology is a vast field and u could find enough references .. could you specify your polymer, and matrix ??
You can find information on the rheological properties of polymers in the following book:
A. V. Shenoy and D. R. Saini, Thermoplastic Melt Rheology and Processing, Marcel Dekker Inc., New York (1996).
Chapter 6 gives Rheological Models for Unified Curves and in Table 6.5 which gives the rheological parameters of the modified Carreau Model, you will find a measure of the relaxation time for various types of thermoplastics – LDPE, HDPE, LLDPE, PP, PS, Cellulose Ester, Cellulose Ether, Acrylic, Nylon, PET, PC, PVDF, PPO, PPS, PAS,PES, PEEK, PEI, PAr, SBS, ABS, EVA. The Table provides you with values of the product of the time constant with the Melt Flow Index (MFI) for each generic-type of thermoplastic. For any polymer, if you know the MFI value, you will be able to get at least an approximate estimate of the relaxation time from the values given in the Table 6.5.
for the viscoelastic properties (relaxation spectrum, for example) I suggest the book of Ferry.
For the rheological properties there are a lot of books: Han, Rheoloigy of Polymers, for example.
Dear Mehran,
If you are talking about relaxation time related to impedance measurement of polymers, here is the paper of my which I attach with this answer.
With regards.
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