Table 2. Thermal properties of PI films.
| Diamine | (I) BPADA | (II) HBPDA | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| IVa (dL g−1) | T g (°C) | T i b (°C) | wt600Rc (%) | CTEd (ppm per °C) | IV (dL g−1) | T g (°C) | T i (°C) | wt600R (%) | CTE (ppm per °C) | |
| BZ | 1.31 | 250 | 358 | 61 | 42 | 0.98 | 243 | 323 | 47 | 44 |
| FDN | 1.04 | 245 | 377 | 67 | 51 | 1.00 | 226 | 364 | 66 | 58 |
| APS | 1.11 | 227 | 342 | 59 | 43 | 0.92 | 217 | 299 | 44 | 46 |
| AHP | 0.87 | 218 | 336 | 40 | 47 | 1.13 | 203 | 274 | 23 | 50 |
a
Inherent viscosity was measured at 27 °C by using a concentration of 0.1 dL g−1 solution in a N,N′-dimethyl acetamide.
b
Initial decomposition temperature at 2% weight loss.
c
Weight residue at 600 °C.
d
Coefficient of thermal expansion for 2nd heating is 50–200 °C.