Table 7.
Thermomechanical properties of the injection-molded poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)]/hydroxyapatite nanoparticles (nHA) parts in terms of dynamic damping factor (tan δ) peak, glass transition temperature (Tg), storage modulus (E’) measured at −40, 37, and 70 °C, and coefficient of linear thermal expansion (CLTE) below and above Tg.
| Part | DMTA | TMA | |||||
|---|---|---|---|---|---|---|---|
| tan δ Peak (°C) | E’ at −40 °C (MPa) | E’ at 37 °C (MPa) | E’ at 70 °C (MPa) | Tg (°C) | CLTE (µ/m·°C) | ||
| Below Tg | Above Tg | ||||||
| P(3HB-co-3HHx) | 10.7 ± 0.4 | 1909.9 ± 50.2 | 519.2 ± 14.2 | 210.5 ± 2.5 | −0.6 ± 0.2 | 64.3 ± 1.1 | 177.2 ± 4.6 |
| P(3HB-co-3HHx) + 2.5 nHA | 10.9 ± 0.2 | 1935.2 ± 41.7 * | 544.1 ± 26.3 * | 212.3 ± 3.1 | −0.3 ± 0.2 | 61.3 ± 0.4 * | 176.1 ± 7.2 * |
| P(3HB-co-3HHx) + 5 nHA | 11.2 ± 0.3 | 1940.1 ± 82.5 * | 557.8 ± 17.1 * | 222.5 ± 4.6 * | −0.1 ± 0.1 | 59.3 ± 0.5 | 175.0 ± 0.8 |
| P(3HB-co-3HHx) + 10 nHA | 11.4 ± 0.5 | 2090.3 ± 74.6 * | 639.0 ± 18.1 * | 256.8 ± 5.1 * | −0.4 ± 0.2 | 58.2 ± 0.4 | 170.2 ± 3.8 * |
| P(3HB-co-3HHx) + 20 nHA | 14.5 ± 0.4 * | 2100.4 ± 65.1 * | 728.8 ± 26.6 * | 333.1 ± 3.4 * | −0.3 ± 0.2 | 56.7 ± 0.7 | 159.1 ± 5.7 * |
* Indicates a significant difference compared with the previous sample (p < 0.05). Level of significance (p) values are included in Table S4.