Table 1.
IR absorption bands of the epoxy GY250 resin, EH polyamine adducts and their crosslinked GY250/EH system.
| IR (frequency, cm−1) | GY250 Epoxy resin | EH606 and EH637 Polyamine adducts | GY250/EH System |
|---|---|---|---|
| Ph-OH str | 3,510 weak | - | - |
| C-OH str | - | - | 3,427 |
| -CH-(O-CH2) epoxy, str | 3,056 | - | 3,055, disappearance |
| Ar =C-H str | 3,030 | 3,029 | 3,026 |
| -NH2, -NH str | - | 3,340-3,170 | -, OH overlay |
| -NH2, -NH bend | - | 1,510, 1,495 | 1,511, disappearance |
| -CH2-, -CH3- assym str | 2,925, 2,967 | 2,918, 2,950 | 2,921, 2,965 |
| -CH2-, -CH3- sym str | 2,855, 2,872 | 2,850, 2,870 | 2,852, 2,865 |
| Ar -C-H overtone | 2,000-1,600 | 2,000-1,600 | 2,000-1,600 |
| -OH bend | - | - | 1,638, overlay |
| Ar -C=C-H str | 1,607,1,580, 1,510 | 1,605, 1,580, 1,510 | 1,602, 1,581, 1,511 |
| -CH2-, -CH3- bend | 1,455, 1,362 | 1,458, 1,374 | 1,460, 1,380 |
| -C-C-O-C- str | 1,247, 1,184 | 1,250, 1,181 | 1,251, 1,182 |
| -C-N- str | - | 1,109, 1,046 | 1,109 |
| -O-C-C str | 1,132 | 1,081 | 1,085 |
| -C-O-C- str | 1,036 | 1,025 | 1,035 |
| CH2-O-CH epoxy, bend | 915 | - | 915, disappearance |
| Ar 1,4 substit. ring and C-O-C (oxirane) | 831 | 829 | 826 |
| Ar =C-H, C-H, | 830, 773 | 735, 698 | 729, 693 |
| -C-H, -N-H bend | 574, 638 | 595, 573 | 550 |