Table 1.
Characterization of nitrocellulose produced by UANS from microcrystalline cellulose. Experimental conditions: 1 g of microcrystalline cellulose and 25 mL of acid solution (13.6 mL of concentrated auxiliary acid + 9.2 mL of 14.4 mol L−1 HNO3 + 2.2 mL H2O) for 40 min at 30 °C and 70% of US amplitude.
| Auxiliary acid | Nitrogen content, % | Degree of Substitution | Viscosity of 2% solution in acetone, cP | Solubility in alcohol-ether mixture (1 + 2 ratio), % |
|---|---|---|---|---|
| H2SO4, 95% | 12.5 ± 0.3 | 2.45 ± 0.04 | 17.0 ± 1.2 | 90 ± 7 |
| H3PO4, 85% | 11.1 ± 0.4 | 1.99 ± 0.02 | 15.8 ± 0.9 | 87 ± 13 |
| CH2O2, 99% | 11.5 ± 0.3 | 2.11 ± 0.03 | 8.91 ± 2.65 | 71 ± 9 |
| CH3COOH, 99% | 10.9 ± 0.6 | 1.94 ± 0.05 | 12.6 ± 0.7 | 91 ± 10 |