Perfluorocyclobutyl-containing transparent polyimides with low dielectric constant and low dielectric loss

Abstract

Polymers with low dielectric permittivity and dielctric loss are essential for microelectrics and wireless communication industries. Perfluorocyclobutyl (PFCB) aryl ether group is proved to afford polymer materials with high fluorine...

Tröger’s Base (TB)-Based Polyimides as Promising Heat-Insulating and Low-K Dielectric Materials

“…Also, all the TB-based PIs exhibited low D k values below 2.80 at 10 GHz (Table ). In particular, the PI-TB-N showed ultra-low D k = 2.25 at 10 GHz, which is lower than those of the commercial Kapton (PMDA-ODA, D k > 3.5), 6FDA-based ( D k = 2.37–2.95 ,, ), BPADA-based ( D k = 2.83–3.18), ester-based ( D k = 2.44–3.26 , ) PIs, and other low dielectric polymers including polyethers (PES, D k ≈ 2.4), poly(phenylene ether)s (PPEs, D k = 2.4-2.6 − ), and benzocyclobutene (BCB)-based polymers ( D k = 2.6–2.8 , ). It is well known that the D k value is closely related to the molecular structures according to the Clausius–Mossotti relation, as shown in eq D normalk − 1 D normalk + 2 = 4 π 3 · ρ · N normalA · α α normalv M = 4 π 3 · K normalp α α normalv V normalv normald normalw Equation can be further derived from eq D normalk = 3 1 − 4 π 3.9 · ( α …”

Polyimide/crown ether composite film with low dielectric constant and low dielectric loss for high signal transmission

“…46 The PI-1lms shows the highest dielectric loss and PI-2 lms exhibit the lowest dielectric loss. [47][48][49] Because the addition of -CH 3 pendant group of PI-2 lms increases the imbalance of PI molecular chain, the imbalance of PI molecular chain is increased, and the reactivity is increased through the addition of electron donating -CH 3 group. The degree of polymerization is increased, which resulted in a decrease of end groups in per unit volume.…”

Dual cross-linking strategy to prepare fluorine-containing poly(arylene ether nitrile) films with a low dielectric constant and ultra-low water uptake

“…16,17 Most of the current studies have demonstrated that the introduction of fluorine into the molecular structure can effectively reduce the dielectric constant due to the low polarizability of fluorine atoms. [18][19][20] Moreover, the introduction of fluorine can endow the material with excellent moisture resistance and good solubility. However, uncross-linked fluorinated polymers often suffer from poor dimensional stability, high chemical sensitivity and weak mechanical strength.…”