Table 1. Physical Properties of the Polyimides.
| polymer | ηinh (dL/g)a | Mnb (g/mol) | PDI | density (g/cm3) | Vw (cm3)c | FFVd | FFVSIM | εe | water absorption at 30 °C (%) | fluorine content (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| PI A | 1.14 | 60 400 | 2.2 | 1.11 | 0.472 | 0.319 | 0.372 | 2.10 | 0.44 | 17.44 |
| PI B | 1.15 | 62 200 | 2.4 | 1.21 | 0.437 | 0.310 | 0.341 | 2.55 | 0.59 | 8.24 |
| PI C | 0.97 | 55 100 | 2.7 | 1.17 | 0.485 | 0.262 | 0.287 | 2.37 | 0.48 | 9.72 |
| PI D | n.d. | n.d. | n.d. | 1.22 | 0.476 | 0.245 | 0.264 | 2.41 | 0.51 | 9.62 |
a
Inherent viscosity at 30 °C.
b
Number-average molecular weight.
c
Specific van der Waals volume estimated using HyperChem computer program, version 7.0.
d
FFV is the fractional free volume determined from Bondi’s formula. FFVSIM is the FFV values of the PIs determined from atomistic molecular dynamics (MD) simulations.
e
Dielectric constant at 1 MHz frequency and 30 °C.