Table 2.
PER degradation rate constant k [1/s] in isothermal conditions of constant air humidity R = 76.4% and different temperature values, with parameters of linear Arrhenius relationship and thermodynamic parameters: activation energy Ea = -aR, enthalpy ∆H≠ = Ea –RT, entropy ∆S≠ = R(lnA-ln[kBT/h].
| T | k ± ∆k [1/s] | r |
linear Arrhenius relationship
f(1/T) = lnk |
Thermodynamic parameters |
|---|---|---|---|---|
| 333 K | (1.005 ± 0.115) 10-5 | -0.993 | a = -12027.594 ± 2583.648 |
Ea[kJ/mol] 124.22 ± 14.12 |
| 343 K | (3.101 ± 0.415) 10-5 | -0.991 | Sa = 1027.97 | |
| 348 K | (4.727 ± 1.093) 10-5 | -0.966 | b =24.588 ± 8.21 |
∆H
≠
[kJ/mol] 121.74±14.39 |
| 353K | (5.768 ± 0.313) 10-5 | -0.997 | Sb = 2.957 | |
| 363 K | (2.256 ± 0.359) 10-4 | -0.987 | r = -0.989 |
∆S
≠[J/mol∙K] 18.974±133.67 |