Research Article
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 |
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