Table 2.
Summary of DMA Results for a Series of Alkyne Monomers AL-(1–3) with a Single Azide Monomer (AZ-2 or AZ-4) Composed 2 mol % CuCl2[PMDETA] and 4 mol % DMPA and Cured with 10 mW/Cm2 UV Lighta
| alkyne cross-linker | azide monomer (AZ-2)
|
||
|---|---|---|---|
| AL-1 | AL-2 | AL-3 | |
| Tg (°C) | 67 | 63 | 73 |
| E30 °C (GPa) | 2.2 | 1.9 | 1.8 |
| E at Tg + 40 °C (MPa) | 3.4 | 2.9 | 2.1 |
| ρ (g/cm3) | ~1.2 | ~1.1 | ~1 |
| Mc (g/mol) | ~1500 | ~1600 | ~2100 |
|
| |||
| alkyne cross-linker | azide monomer (AZ-4)
|
||
| AL-1 | AL-2 | AL-3 | |
|
| |||
| Tg (°C) | 81 | 90 | – |
| E30 °C (GPa) | 1.4 | 1.8 | – |
| E at Tg + 40 °C (MPa) | 2.1 | 6.7 | – |
| ρ (g/cm3) | ~1.1 | ~1.3 | – |
| Mc (g/mol) | ~2300 | ~900 | – |
a
ρ is the density of the material estimated from the dimension and mass of the sample; Mc is the molecular weight between cross-links calculated from the equation MC = 3ρRT/2E, where R is the gas constant; (−) represents no data collected because AZ-4 and Al-3 are both solid monomers and no resin was formulated.