Table 1.

Thermal and dielectric properties of nonporous PI and PI sponge films.

Sample	Tg (°C)	Td5% (°C)	Td10% (°C)	Char Residue at 800 °C (%)	Dielectric Constant at 1 MHz	Dielectric Loss at 1 MHz
Nonporous PI film	381	564	589	57.47	3.29	5.60
PI Sponge film	392	577	596	53.56	2.01	3.34