Hello everyone,
I want to produce a carbon molecular sieve (CMS) by pyrolysis PEI polymer. So, I put ten chains of PEI in a box with the amorphous cell module in Material studio with an initial density of 0.1 g/cm3.
I know I should use the ReaxFF for pyrolysis, but for preparing the initial structure, I went through two different processes:
- I used the Dreiding force field, annealing 300 to 700 K (NVT), compressing and decompressing from 0.1 Gpa to 1 bar at 700 K (NPT), 300 K, and 1bar (NPT) and 300 K NVT.
- I used the ReaxFF and the exact steps like process 1.
The final density of the structure with Dreiding equals 1.05 g/cm3 (I think it’s so dense and does not have enough porosity), but with ReaxFF, this parameter is equal to 0.45 g/cm3.
Well, I don’t know which method is correct!
Does anyone have any information or experience on preparing CMS with pyrolysis?
I want to know what to do to build the initial structure. Until then, do pyrolysis in the NVT ensemble.
I would be grateful if someone could help me.
Best regards,
Zoha