Introduction of fluorin into PBO polymer chains: Toward higher thermal stability and lower dielectric constant

Abstract

A series of novel fluorinated benzoxazole polymers (6FPBO's) with high thermal stability and low dielectric constant were synthesized by copolymerization of 1,3-diamino-4, 6-dihydroxybenzene dihydrochloride (DAR), 1,4-benzenedicarboxylic acid (PTA) and various amount of 4'4-(hexafluoroisopropylidene) bis (benzoic acid) (BIS-B-AF) in the medium of polyphosphoric acid (PPA). 6FPBO fibers were then obtained via dry-jet wet-spinning technique and characterized by means of Fourier transform infrared (FTIR) spectra, thermogravimetric analysis (TGA), single fiber tensile testing machine and scanning electron microscopy (SEM). FTIR spectrum of 6FPBO fibers indicated that the fluorine groups had been incorporated into PBO molecular chains successfully. TGA curves revealed that 6FPBO fiberspossessed high thermal stability just as pure PBO fibers. Moreover, dielectric constant spectrum of 6FPBO exhibited that the polymers had low dielectric constant, especially in the range of high-frequency.fluorinated PBO fiber, synthesis, tensile strength, thermal stability, dielectric constant

Cell morphology and mechanical properties of microcellular mucell® injection molded polyetherimide and polyetherimide/fillers composite foams

“…As shown in Figure , the dielectric constant and thermal conductivity of samples declined as the mass density of microcellular PEI foams decreased. It was probably because the introduction of cell increased the free volume of internal microstructure and reduced the number of polarization groups within the unit volume, which led to the reduction of dielectric constant . At the same time, it is well known that the thermal conduction of materials is caused by the colliding and transferring of microscopic particles in materials .…”

An ultralow-k dielectric derived from a fluorinated polybenzoxazole composite film with yolk–multishell mesoporous silica nanostructures

“…44 In addition, fluorinated PBO (6FPBO) with a lower dielectric constant ( k = 2.5–2.7) and lower water absorption becomes a very promising candidate for the prosperous semiconductor era. 45–49…”

Self-assembly of a semi-fluorinated diblock copolymer in a selective solvent

“…Besides tuning the interaction energies, introducing fluorine to a polymer backbone enhances chemical and thermal stability, controlled surface energy, control dielectric constant and controlled reflective index. 10,[22][23][24] Inserting fluorine however increases the rigidity of the polymer and changes its thermodynamic characteristics. In the current study, we have investigated the shape and transformation of a highly segregating diblock copolymer, polytrifluoro propyl methylsiloxane-b-polystyrene (SiF-PS), whose chemical structure is given in Fig.…”