Table 3.
Effect of different modification methods before and after the stability tests on the melting temperature (Tm), enthalpy (Δhm) and the degree of crystallinity (χ) in the pristine PVDF membrane (p-PVDF), coated membranes with FAS/TEOS and FAS/APTES (Coat-TEOS and Coat-APTES, respectively) and modified membranes with oxygen plasma activation at 15 W for a period of 15 min and functionalised with FAS/TEOS and FAS/APTES (PO2-TEOS and PO2-APTES, respectively).
| Before Stability Test | After Stability Test | |||||
|---|---|---|---|---|---|---|
| Tm, °C | Δhm, J g−1 | χ, % | Tm, °C | Δhm, J g−1 | χ, % | |
| p-PVDF | 162.3 | 59.3 | 60.6 | 162.0 | 62.2 | 63.5 |
| Coat-TEOS | 164.0 | 53.0 | 54.1 | 164.0 | 54.9 | 56.1 |
| Coat-APTES | 164.3 | 55.0 | 56.2 | 162.6 | 54.7 | 55.9 |
| PO2-TEOS | 162.3 | 54.2 | 55.4 | 161.8 | 58.1 | 59.3 |
| PO2-APTES | 162.9 | 57.0 | 58.2 | 163.4 | 58.9 | 60.2 |