Characterization of Dielectric Relaxation Process by Impedance Spectroscopy for Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

Table 1

Chemical compositions of NBR and EPDM specimens.

Function	NBR	EPDM
Polymer	NBR (40)	EPDM (58)
Filler-reinforcing	Carbon black (50)	Carbon black (34)
Processing aid	1, 2-benzenedicarboxylic acid (6)	—
Antioxidant	2-benzimidazolethiol (2)	—
Curing agent	Sulfur (2)	Zinc oxide (3); Dicumyl peroxide (5)

Numbers in () are weight ratios in %.