Insulation properties of the films.
| Sample | Electrical insulation strength (kV mm−1) | Volume resistivity (Ω cm) | ||
|---|---|---|---|---|
| Air, 25 °C | Immersion in water for 24 h | Air, 25 °C | Immersion in water for 24 h | |
| WRPE21 | 68.7 | 32.3 | 3.2 × 1015 | 2.7 × 1014 |
| WRPE22 | 75.3 | 36.5 | 6.3 × 1015 | 8.4 × 1014 |
| WRPE23 | 81.6 | 40.6 | 1.0 × 1016 | 3.2 × 1015 |
| WRPE24 | 76.2 | 38.4 | 8.2 × 1015 | 7.8 × 1014 |
| WRPE25 | 69.4 | 35.1 | 7.6 × 1015 | 2.2 × 1013 |
| WRPE31 | 51.5 | 25.3 | 5.2 × 1014 | 7.6 × 1013 |
| WRPE32 | 63.2 | 29.4 | 9.3 × 1014 | 2.8 × 1014 |
| WRPE33 | 75.8 | 34.9 | 5.6 × 1015 | 9.2 × 1014 |
| WRPE34 | 70.4 | 31.9 | 3.2 × 1015 | 8.1 × 1013 |
| WRPE35 | 62.6 | 29.3 | 1.6 × 1015 | 8.4 × 1012 |