Enhanced Strain-Dependent Electrical Resistance of Polyurethane Composites with Embedded Oxidized Multiwalled Carbon Nanotube Networks

Table 1

Summary of FTIR measurements for the pristine and oxidized MWCNT-Ns.

Possible assignments	Wavenumber (cm^−1)
	MWCNT-N	MWCNT-N; (H2O2)	MWCNT-N; (HNO3)	MWCNT-N; (KMnO4)
OH stretch	3435	3459	3428	3427
C–H stretch (CH2, CH3)	2908, 2840	2977, 2888	2980, 2880	2978, 2888
C=O stretch (carboxyl or ketone)	1705	1718	1726	1710
Intermediate oxidized products—quinone groups	1652	1637	1661, 1635	1641
C=C stretch	1559	1565	1580	1569
CH2/CH3 bending	1460	1443	1437	1440
Skeletal C–C tangential motions + C–O stretch	1222	1219, 1167	1184	1190
C–O stretch	1082	1083, 1052	1084, 1049	1087, 1046