Difference in variation of glass transition activation energy between 1,2-propanediamine and 1,2-propanediol

- Activation energy of glass transition was studied for a polyamine and polyalcohol.
- Trend in the activation energy with T is completely different between the liquids.
- Disparity in glass transition dynamics is related to hydrogen-bonding networks.
- Variability of the activation energy is correlated with fragility.