TABLE 2.
Effect of nitrogen on molecular weight, thermal and mechanical properties of polymer produced by Haloferax mediterranei after 96 hr of cultivation
| Nitrogen Source | C/N | Molecular weight a | Thermal properties (°C) b | Mechanical properties c | |||
|---|---|---|---|---|---|---|---|
| M w (kDa) | PDI [M w/Mn] | T g | T m1 | T m2 | Tensile (MPa) | ||
| YE | 9 | 1,014 | 1.8 | 1.2 | 147.5 | ND | 14.4 |
| YE | 20 | 276 | 5.8 | ND | 140 | 148.1 | 2.8 |
| YE | 35 | 277 | 4.9 | 1.5 | 144.6 | 157.2 | 1.1 |
| NH4Cl | 9 | 493 | 2.2 | −7.5 | 156.2 | ND | 7.3 |
| NH4Cl | 20 | 908 | 2 | −2.7 | 151.9 | ND | 3.7 |
| NH4Cl | 35 | 759 | 1.8 | −6.1 | 158.2 | ND | 1.9 |
| YE + NH4Cl | 9 | 134 | 3.3 | ND | 136.9 | 1525 | ND |
| YE + NH4Cl | 20 | 211 | 3.5 | ND | 139.4 | 153.9 | 2.4 |
| YE + NH4Cl | 35 | 70 | 2.9 | ND | 136.6 | 154.1 | ND |
a
M w, weight average molecular weight; PDI, polydispersity index [M w/M n].
b
T g, glass transition temperature; T m, melting temperature; ND, not detectable.
c
Tensile strength.