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Multilayer poly(p‐phenylene biphenyltetracarboximide) (BPDA‐PDA) polyimide films of 172 μm total thickness (11.4 μm per layer) were prepared from the poly(amic acid) precursor solution through repetition of a spin‐coat/softbake/cure process. Wide‐angle x‐ray diffraction results indicate that the polyimide molecules in the multilayer films are highly ordered along the chain axes as well as in the lateral direction and furthermore are highly oriented in the film plane as observed in a single‐layer film of 11.4 μm thickness. The multilayer films showed the same dynamic mechanical properties and glass transition behavior (Tg = 330 °C) as a single‐layer film. For the multilayer films both the in‐plane dielectric constant (e’XY) and out‐of‐plane thermal‐expansion coefficient (αZ) were measured using time‐domain spectroscopy and conventional thermal mechanical analysis, respectively. The e’XY at room temperature was 3.69 (±0.08) over a frequency range of 0.35–2.50 THz. A similar e’XY is predicted at frequencies ...

Anisotropic properties of high-temperature polyimide thin films: Dielectric and thermal-expansion behaviors