Arrhenius-Frenkel- Eyring equation :
n = A*eE/RT
where,
n = viscosity,
A= empirical constant,
E = activation energy,
R = universal gas constant,
T= temperature.
It is well known that for most polymers viscous flow activation energy is the minimum energy required for the flow unit (chain segment) to overcome the barrier and transit from the in-situ position to the nearby “hole” in the flow process, and it is a sign of the sensitivity for the apparent shear viscosity to temperature.
https://www.hindawi.com/journals/apt/2019/1070427/
You might want to call Huntsman and ask them about activation of their resins.
https://www.huntsman.com/corporate/a/Home
The temperature sensitivity of polymer melt viscosity can be assessed through the activation energy. An increase in temperature sets up thermal motion of the molecules, resulting in their displacement based on the available free motion and the overcoming of the forces of intermolecular interactions. The Arrhenius type of equation is based on the absolute theory of rate processes. Activation energy will tell how much energy is required for the melt flow when the temperature is raised from one temperature to another higher temperature. Hence, a lower activation energy would mean that the polymer melt would flow more efficiently.
More detailed discussion on activation energy is available on pages 86 and 87 of the following book:
A. V. Shenoy and D. R. Saini, Thermoplastic Melt Rheology and Processing, Marcel Dekker Inc., New York (1996).
Values of the activation energies for various polymers such as LDPE, HDPE, LLDPE, PP, PS, Ethyl cellulose, Cellulose acetate butyrate, Cellulose propionate, Acrylic, Nylon, PET, PBT, PC, PVDF, PPO, PPS, PES, PEEK, PEI, PAr are available on pages 127 - 131 of the above-mentioned book.
Please see the references below:
https://doi.org/10.1080/00222348308215200 https://doi.org/10.1080/00222348.2015.1119340
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