Table 5.
Performance comparison of different PI foams.
| PI Foams | Density (kg/m3) | Closed-Cell Rate (%) | Tg (°C) | Compressive Strength (MPa) | Compressive Modulus (MPa) |
|---|---|---|---|---|---|
| PIF-2 (this work) α-BPDA-PDA/BIA |
100 | 91 | 395 | 1.10 | 25.7 |
| 150 | 95 | 395 | 3.70 | 77.6 | |
| α-BPDA-PDA [27] | 100 | 89 | 374 | 1.34 | 37.1 |
| α-BPDA-3,4′-ODA [27] | 100 | 82 | 318 | 0.96 | 21.1 |
| α-BPDA-4,4′-ODA [27] | 100 | 86 | 364 | 0.70 | 16.3 |
| BTDA-4,4′-ODA [15] | 32 | 32 | 300 | 0.30 | 11.03 |
| ODPA-3,4′-ODA [15] | 80 | - | 237 | 0.84 | 6.13 |
| 32 | 32 | 237 | 0.19 | 3.89 | |
| BTDA-MDA/BDM [25] | 101 | - | 285 | 0.86 | 10.79 |
| BTDA-4,4′-ODA/BIA [28] | 243 | - | 345 | 7.45 a | 23.8 a |
| ODPA-4,4′-ODA/BIA [31] | 54 | - | 306 | 0.71 | - |
| BTDA-4,4′-ODA/DAPBO [32] | 77 | - | 368 | 1.03 | - |
Compressive properties were tested at 10% strain. a These compressive properties were measured at 15% strain. Abbreviations: ODPA, 4,4′-oxydiphthalic anhydride; 3,4′-ODA, 3,4′-oxydianiline; 4,4′-ODA, 4,4′-oxydianiline; BTDA, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride; MDA, 4,4-diaminodiphenyl methane; BDM, 4,4′-bismaleimidediphenylmethane; PDA, p-phenylenediamine; α-BPDA, 2,3,3′,4′-biphenyl tetracarboxylic dianhydride; BIA, 2-(4-aminophenyl)-5-aminobenzimidazole; m-PDA, m-phenylenediamine; DAPBO, 2-(4-aminophenyl)-5-aminobenzoxazole.