The Effect of High Loaded Multiwall Carbon Nanotubes in Natural Rubber and Their Nonlinear Material Constants

Table 5

Peak values of IR spectra of samples.

Sample	Peak frequency (cm^−1)	Bond
Unfilled NR	2918, 2854	C-H stretch (-CH3)
	1600	C=C stretching
	1519, 1443	C-H bending (CH3)
	1242, 1136	C-H wag (CH2-X)
	1032, 969, 829, 754	=C-H bend
	565	C-Br stretch
MWCNT	519, 455	C-Br stretch
NR/5 phr MWCNT	2918, 2854	C-H stretch (-CH3)
	1441, 1373	C-H bending (CH3)
	973, 830, 740	=C-H bend
NR/10 phr MWCNT	2916, 2851	C-H stretch (-CH3)
	1516, 1376	C-H bending (CH3)
	968	=C-H bend
NR/20 phr MWCNT	2914	C-H stretch (-CH3)
	1515, 1381	C-H bending (CH3)
	1238	C-H wag (CH2-X)
	965	=C-H bend
NR/30 phr MWCNT	1510, 1378	C-H bending (CH3)
	1233	=C-H bend