Table 2.
Gelling time of different iCMBAs and anti-fungal iCMBAs cross-linked by various ratios of oxidants (silver nitrate, SN or sodium periodate, PI) under different pH values at room temperature (pre-polymer concentration was 50 wt% for all samples).
| Pre-polymer name a | Oxidant Concentration used (g/mL) |
Oxidant to pre-polymer ratio (g/g polymer) b |
Test pH value c |
Measured gel time (s) |
|---|---|---|---|---|
| iC-P200 | SN 0.15 | 0.15 | 2.8 | uncross-linkable |
| iC-P200 | SN 0.15 | 0.15 | 5 | 578 |
| iC-P200 | SN 0.15 | 0.15 | 7 | 363 |
| iC-P200 | SN 0.15 | 0.15 | 8.5 | 149 |
| AiC-P200 | SN 0.10 | 0.1 | 8.5 | 99 |
| AiC-P200 | SN 0.15 | 0.15 | 8.5 | 53 |
| AiC-P400 | SN 0.15 | 0.15 | 8.5 | 85 |
| AiC-P1000 | SN 0.15 | 0.15 | 8.5 | 193 |
| AiC-P3A1000 | SN 0.15 | 0.15 | 8.5 | 48 |
| AiC-P4A800 | SN 0.15 | 0.15 | 8.5 | 26 |
| AiC-P2/4 (1/1) | SN 0.15 | 0.15 | 8.5 | 66 e |
| AiC-P2/4 (1/1) | PI 8 wt% | 8 wt% to polymer | As it d | 126 e |
For the ones cross-linked by silver nitrate (SN), pre-polymers were dissolved in 0.1 M Tris-HNO3 (pH 13) buffer with a concentration of 50 wt%; for those cross-linked by sodium periodate (PI), pre-polymer was dissolved in DI water with a 50 wt% concentration.
Silver nitrate (SN) used was dissolved in 0.1 M Tris-HNO3 (pH 8.5) buffer, while sodium periodate (PI) was dissolved in DI water.
For the ones cross-linked by SN, the tested pH values were adjusted using 12 M NaOH and 70% nitric acid.
Pre-polymer was dissolved in DI water (50 wt%) and used as is.
Obtained by vial tilting method.