Enhancement the Thermal Stability and the Mechanical Properties of Acrylonitrile-Butadiene Copolymer by Grafting Antioxidant

Table 1

Formulation of NBR vulcanizates containing PBN, NR-g-o-AP, and control vulcanizate.

Ingredient (phr) ↓	Mix name
	A1	A2	A3
NBR	100	100	100
ZnO	5	5	5
Stearic acid	2	2	2
Processing oil	5	5	5
Semireinforcing furnace (SRF)	30	30	30
Sulfur	1.5	1.5	1.5
Mercaptobenzthiazole “MBT”	0.75	0.75	0.75
Tetramethylthiuramdisulphide “TMTD”	0.75	0.75	0.75
N-phenyl-𝛽-naphthylamine “PBN”	—	1	—
NR-graft-o-AP	—	—	5
Cure time (min.)	8	6	9.5