Dielectric Relaxation Spectroscopy in Synthetic Rubber Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

Table 4

Activation energies and pre-exponential factors for α’-, β-, and γ-relaxations in NBR.

Type of relaxation	Ea (kJ/mol)	(Hz)	Ea in previous study [39] (kJ/mol)
α’	82.7 ± 3.4	1.1 × 10^16
β	22.4 ± 3.2	1.2 × 10^5	21.9
γ	10.2 ± 6.2	6.6 × 10^5	15.5