Table 1.
Vibrational assignments for crosslinked PAA and the effect of PEG tether addition on the spectra of P(AA-g-PEG) microparticles
| Wavenumber (cm-1) | Intensity1 | Assignment2 | |
|---|---|---|---|
| x-PAA | PAA-g-PEG | ||
| 3440 | v | υ (O-H) free groups | |
| ~3200 | m | υ (O-H) associated w/water | |
| 2970 | w | υa (C-H) CH2 | |
| 2890 | m-s | υa (CH3) | |
| ~2620 | w | υ (O-H) bonded groups | |
| 1710 | shifts to slightly higher | s | υ (C=O) |
| 1560 | s | υ carboxylate ion | |
| 1460 | 1460 | w | δ (CH2) out of plane |
| 1260 | s | υ (C=O) or δ (O-H) | |
| 1190 | s | related to 1260 | |
| 1110 | s | υ (C-O-C) | |
| 820 | w | γ (CH2) | |
1
Intensity: v, variable, w, weak, m, medium, s, strong.
2
Vibrtations: υ, stretching, a, asymmetric, δ, bending, γ, rocking.