Reinforcement of Multiwalled Carbon Nanotube in Nitrile Rubber: In Comparison with Carbon Black, Conductive Carbon Black, and Precipitated Silica

Table 4

Mechanical properties of NBR vulcanizates.

Properties	Loading (phr)	MWCNT	CCB	CB	PSi
Tensile strength (MPa)	0	2.9 ± 0.37	2.9 ± 0.4	2.9 ± 0.4	2.9 ± 0.4
	5	8.6 ± 0.1	4.3 ± 0.1	4.1 ± 0.2	3.6 ± 0.4
	10	12.9 ± 0.4	9.1 ± 0.2	5.3 ± 0.5	3.8 ± 0.2
	15	17.7 ± 0.5	14.6 ± 0.6	8.5 ± 1.5	5.3 ± 0.3
Elongation at break (%)	0	182 ± 14	182 ± 14	182 ± 14	182 ± 14
	5	176 ± 2	196 ± 3	202 ± 10	210 ± 17
	10	178 ± 3	244 ± 2	217 ± 14	220 ± 1
	15	171 ± 6	277 ± 6	231 ± 14	218 ± 10
Modulus at 100% (MPa)	0	1.73 ± 0.04	1.73 ± 0.04	1.73 ± 0.04	1.73 ± 0.04
	5	5.04 ± 0.09	1.93 ± 0.02	1.82 ± 0.10	1.79 ± 0.06
	10	7.49 ± 0.56	2.47 ± 0.07	1.79 ± 0.05	1.75 ± 0.06
	15	11.28 ± 0.35	3.30 ± 0.27	2.15 ± 0.10	2.30 ± 0.12
Hardness (Shore A)	0	53.3 ± 0.3	53.3 ± 0.3	53.3 ± 0.3	53.3 ± 0.3
	5	61.8 ± 0.3	56.0 ± 0.0	55.3 ± 0.3	54.8 ± 0.8
	10	69.0 ± 0.5	61.7 ± 0.6	56.5 ± 0.9	56.8 ± 1.0
	15	69.3 ± 0.8	65.5 ± 0.5	58.2 ± 0.3	59.9 ± 0.8
Heat build-up (°C)	0	7.5 ± 0.7	7.5 ± 0.7	7.5 ± 0.7	7.5 ± 0.7
	5	11.5 ± 0.7	9.0 ± 0.0	8.0 ± 0.0	8.0 ± 0.0
	10	18.5 ± 0.7	14.0 ± 0.0	9.0 ± 0.0	9.0 ± 0.0
	15	29.0 ± 1.4	21.0 ± 0.0	10.5 ± 0.7	10.0 ± 0.0
Abrasion loss (mm^3)	0	250.7 ± 10.8	250.7 ± 10.8	250.7 ± 10.8	250.7 ± 10.8
	5	82.0 ± 12.7	91.4 ± 10.0	188.2 ± 4.7	171.2 ± 25.0
	10	54.2 ± 3.7	54.9 ± 3.1	132.6 ± 12.6	155.7 ± 8.8
	15	48.0 ± 2.6	53.3 ± 1.3	90.8 ± 6.3	127.7 ± 9.9