Table 4.
Mechanical properties of novel wholly aromatic azopolyamide-hydrazides containing various proportions of para-phenylene and meta-phenylene units.
| Polymer code | Mechanical properties a | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| As cast | Heat drawn b | |||||||||||
| At 140 °C | At 160 °C | At 180 °C | ||||||||||
| M | E | T | M | E | T | M | E | T | M | E | T | |
| I | 5.8 | 47.3 | 287.6 | 9.3 | 26.3 | 378.1 | 14.9 | 16.3 | 477.9 | 30.9 | 6.2 | 885.6 |
| II | 4.8 | 68.5 | 249.6 | 7.9 | 34.2 | 326.9 | 12.8 | 19.8 | 408.7 | 26.1 | 9.3 | 739.2 |
| III | 3.9 | 91.8 | 213.3 | 6.5 | 42.1 | 271.4 | 10.5 | 23.8 | 336.2 | 20.1 | 12.3 | 595.3 |
| IV | 3.5 | 100.2 | 181.4 | 5.4 | 51.0 | 220.6 | 9.1 | 29.1 | 215.4 | 17.6 | 13.5 | 555.6 |
| V | 2.8 | 108.2 | 147.2 | 4.2 | 60.2 | 168.8 | 7.6 | 34.7 | 191.7 | 15.0 | 14.5 | 515.9 |
| VI | 2.5 | 121.4 | 116.7 | 4.1 | 63.9 | 148.6 | 6.7 | 36.6 | 179.1 | 13.2 | 17.3 | 449.6 |
| VII | 2.0 | 136.4 | 87.8 | 3.9 | 68.6 | 126.9 | 5.5 | 38.9 | 166.1 | 11.2 | 20.9 | 383.5 |
| VIII | 1.8 | 147.2 | 62.3 | 3.2 | 80.1 | 118.2 | 4.2 | 42.6 | 155.9 | 10.1 | 22.5 | 312.3 |
| IX | 1.5 | 157.9 | 36.5 | 2.3 | 92.5 | 108.1 | 3.7 | 46.6 | 144.4 | 8.9 | 24.7 | 237.6 |
| X | 1.3 | 167.7 | 31.1 | 1.9 | 100.2 | 91.7 | 3.0 | 53.7 | 120.9 | 7.4 | 29.4 | 198.1 |
| XI | 1.1 | 177.5 | 26.1 | 1.6 | 108.5 | 72.4 | 2.4 | 60.7 | 98.1 | 5.8 | 32.9 | 158.4 |
| XII | 0.7 | 181.2 | 23.4 | 1.1 | 120.3 | 56.6 | 1.6 | 67.9 | 74.7 | 4.4 | 35.2 | 138.6 |
a Measured at room temperature, M is the elastic Yong’s modulus (GPa), T is the tensile strength (MPa), and E is the elongation-at-break (%); b Achieved by hand at a preselected temperature till break (maximum stretching).