Synthesis and characterization of highly-fluorinated colorless polyimides derived from 4,4′-((perfluoro-[1,1′-biphenyl]-4,4′-diyl)bis(oxy))bis(2,6-dimethylaniline) and aromatic dianhydrides

Ullmann Reaction Optimization within Bitolyl and Decafluorobiphenyl Synthesis

“…Decafluorodiphenyl is used as initial reagent for producing octafluorobenzidine 21 , a monomer used for polymer synthesis 22 , particularly fluorinated polyimide 23 films. Aromatic polyimides have been paid great attention in the microelectronics as interlayer dielectrics due to their properties, including high thermal stability, chemical resistance and good mechanical and electrical properties.…”

Recent Trends on Transparent Colorless Polyimides with Balanced Thermal and Optical Properties: Design and Synthesis

“…Two new perfluorinated monomers, 4,4 ′ ‐((perfluoro‐[1,1 ′ ‐biphenyl]‐4,4 ′ ‐diyl)bis(oxy))bis(2,6‐dimethylaniline) (8FBPODMA) and 4,4 ′ ‐((perfluoro‐[1,1 ′ ‐biphenyl]‐4,4 ′ ‐diyl)bis(oxy))dianiline (8FBPOA) were synthesized by Yeo et al. by the action of decafluorobiphenyl and 4‐amino‐3,5‐xylenol and 4‐aminophenol, respectively, using K 2 CO 3 as base ( Scheme ) . In comparison with the PIs derived from 8FBPOA, the PIs from 8FBPODMA were more optically transparent (λ 0 : 310–362 nm) and have lower refractive indices and birefringences due to structural hindrance of intermolecular packing by their ortho ‐substituted methyl groups.…”

Preparation and Characterization of Pure Organic Dielectric Composites for Capacitors

“…The polyamic acid (PAA) precursor was polymerized from ODA and PMDA in freshly distilled DMAC under stirring at room temperature for 24 h. Then, different amounts of PVDF powders (10,20,30,40, and 50 wt.%) were ultrasonically dispersed in DMAC for 1 h. In order to prepare homogeneous and different concentrations of PVDF/PAA solution, various weight fractions of PVDF/DMAC dispersion were added into the PAA solution with further vigorous stirring for 24 h. Then, the PAA was imidized using a standard thermal imidization method. Subsequently, the mixture was cast onto a piece of clean glass plate, and thermally imidized at 50, 100, 150, 200, and 250 °C for 1 h and 300 °C for 0.5 h to form PI/PVDF composite films.…”

“…corresponds to the C=O asymmetric stretching vibration, 1720 cm −1 corresponds to the C=O symmetric stretching vibration, 1370 cm −1 corresponds to the C-N-C stretching vibration, and 720 cm −1 corresponds to the C=O bending vibration [26][27][28]. Furthermore, the absence of the characteristic absorption bands of PAA at approximately 1660 cm -1 corresponds to the amic acid C=O symmetric stretching vibration and 1535 cm -1 corresponds to the amide C-N asymmetric stretching vibration indicates complete imidization in the resulting composites [29,30].…”