Dear Salah

There is a software, you can calculate the activation energy in a just a few seconds, its name is AKTS (Advanced Kinetic and Technology Solution) all what you need is to load your different heating rates TGA or  DSC curves ( heating rates should be below 8 K/min i.e. 1, 2, 4, 6 ,8 K/min)

http://www.akts.com/

However, if you still interesting in calculating the Ea using Excel, please let me know

Hope this helping

Have a very good day

Ahmed 

I'm not sure what do you mean with "simplest", either be easy, fast or both. Anyway, I suggest to read ASTM E1641, it's a very reliable method when looking for activation energy by using a TGA.

Thank you.

Please find the attached file for your question

Thank you Mostafa Rezaei

Dear Mr. Salah,

I think you can use rheological data to calculate activation energy. of course it depends on your samples whether they are thermorheologically complex or simple. you can use Modulus (Storage or Loss) and shear rate viscosity to calculate activation energy.

Dear Salah

There is a software, you can calculate the activation energy in a just a few seconds, its name is AKTS (Advanced Kinetic and Technology Solution) all what you need is to load your different heating rates TGA or  DSC curves ( heating rates should be below 8 K/min i.e. 1, 2, 4, 6 ,8 K/min)

http://www.akts.com/

However, if you still interesting in calculating the Ea using Excel, please let me know

Hope this helping

Have a very good day

Ahmed