Novel fluorinated random co-polyimide/amine-functionalized zeolite MEL50 hybrid films with enhanced thermal and low dielectric properties

A series of fluorinated random co-polyimide/amine-functionalized zeolite MEL50 hybrid films (co-FPI/MEL50-NH₂) was successfully prepared with the addition of MEL50-NH₂ (e.g., 0, 1, 3, 5, 7 wt% of the co-FPI). Thereinto, zeolite MEL50 was synthesized by hydrothermal method and co-FPI was obtained by random copolycondensation from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl] propane dianhydride (BPADA), 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 4,4′-diaminodiphenyl ether (ODA). Then, the properties of the hybrid films such as morphology, thermal properties, UV transparency and dielectric constant were investigated to probe the effect of incorporation of MEL50 on PI matrix. The results showed that the thermal properties and low dielectric properties of the hybrid films were markedly enhanced to achieve the optimum with the addition of 3 wt% MEL50-NH₂. In our results, the glass transition temperature increased up to 266 °C from 243 °C of the pristine co-FPI film and 5% weight loss temperature increased up to 527 °C from 517 °C of the pristine co-FPI film in nitrogen. The dielectric constant decreased down to 2.68 from 3.21 of the pristine co-FPI film. This convenient approach provides a possibility of making PI possess both enhanced thermal properties and low dielectric constant, which is more applicable to microelectronics.