Synthesis, Characterization, and Studies of Heat-Resistant Poly(ether benzimidazole)s

Anbaoui, Z.; Lajrhed, N.; Berrada, Mohamed Saleh; Knouzi, N.; Vaultier, Michel; Sekiguchi, Hikaru; Carrière, F.

doi:10.1021/cm970098p

Cited by 35 publications

(15 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typical synthesis of bisbenzimidazoles involves a reaction between o ‐phenylenediamines with a diacid or diamide in HCl or PPA (PPA) 29. The synthesis of BBDCA has not been previously reported.…”

Section: Resultsmentioning

confidence: 99%

A new sequence isomer of AB‐polybenzimidazole for high‐temperature PEM fuel cells

Gulledge

Benicewicz

2011

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

A new sequence isomer of AB‐polybenzimidazole (AB‐PBI) was developed as a candidate for high‐temperature polymer electrolyte membrane fuel cells. A diacid monomer, 2,2′‐bisbenzimidazole‐5,5′‐dicarboxylic acid, was synthesized and polymerized with 3,3′,4,4′‐tetraaminobiphenyl to prepare a polymer that was composed of repeating 2,5‐benzimidazole units. In contrast to previously prepared AB‐PBI, which contains only head‐to‐tail benzimidazole sequences, the new polymer also contains head‐to‐head and tail‐to‐tail benzimidazole sequences. The polymer was prepared in polyphosphoric acid (PPA) and cast into membranes using the sol–gel PPA process. Membranes formed from the new AB‐PBI were found to be mechanically stronger, possessed higher acid doping levels, and showed improved fuel cell performance, when compared to the previously known AB‐PBI. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

show abstract

Section: Resultsmentioning

confidence: 99%

A new sequence isomer of AB‐polybenzimidazole for high‐temperature PEM fuel cells

Gulledge

Benicewicz

2011

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

show abstract

“…There is now considerable interest in producing heterocyclic rigid-rod polymers [1,2]. Some high-performance fibers such as poly(p-phenylene terephthalamide) (Kevlar TM or Twaron TM ) [3], poly(p-phenylene benzobisthiazole) (PBT) [4,5], poly(p-phenylene benzobisoxazole) (PBO) [6,7], poly(p-phenylene benzobisimidazol) (PBI) [8][9][10], and PIPD (M5) [11][12][13][14] have been studied by many authors. There are now several kinds of heterocyclic fibers available commercially.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of novel PMDA/ODA/PABZ polyimide fibers

Liang

et al. 2008

Polymer Engineering & Sci

View full text Add to dashboard Cite

A series of random copolyamic acid were synthesized from various ratios of two diamines 4, 4′‐oxydianiline (ODA) and 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ) by polycondensation with pyromellitic dianhydride (PMDA) in N‐methyl‐2‐pyrrolidone (NMP). Their inherent viscosities were in the range of 1.89–2.91 dl/g. The polyamic acid (PAA) solution drops were spun into fibers by the wet spinning process. The polyimide (PI) fibers were obtained from PAA fibers after drawn and treated in heating tube. The fibers were characterized by fourier transform infrared (FTIR), wide X‐ray diffraction (WAXD), scanning electron microscope (SEM), thermal gravimetry analysis (TGA), dynamic mechanical analysis (DMA), and tensile testing. WAXD showed these PI fibers were basically amorphous. The tensile strength and initial modulus of the PI fiber reached 1.53 and 220.5 GPa when diamine ratio of PABZ/ODA was 7/3, which were almost three times and 30 times over that of the PMDA/ODA PI fibers. TGA showed that the PI fibers were thermally stable with 10% weight losses recorded in the range of 492–564°C under nitrogen atmosphere, and their glass transition temperature (Tg) were found to be 410–440°C by DMA with increasing PABZ content from 30 to 70%. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

show abstract

“…A typical synthesis of bisbenzimidazoles involves a reaction between o-phenylenediamines with a diacid in hydrochloric acid or polyphosphoric acid. 20 Synthesis of 2-substituted benzimidazoles from the reaction of o-phenylendiamine with an imidate are also well known. 21 Synthetic knowledge of these procedures can be applied to polymeric systems when di-functional monomers are incorporated, however, challenges arise when considering polymer solubility and degree of polymerization.…”

mentioning

confidence: 99%

Solution polymerization of polybenzimidazole

Fishel¹,

Gulledge²,

Pingitore³

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

Polybenzimidazoles (PBI) are an important class of heterocyclic polymers that exhibit high thermal and oxidative stabilities. The two dominant polymerization methods used for the synthesis of PBI are the melt/solid polymerization route and solution polymerization using polyphosphoric acid as the solvent. Both methods have been widely used to produce high-molecular weight PBI, but also highlight the obvious absence of a practical organic solution-based method of polymerization. This current work explores the synthesis of highmolecular weight meta-PBI in N,N-dimethyl acetamide (DMAc). Initially, model compound studies examined the reactivity of small molecules with various chemical functionalities that could be used to produce 2-phenyl-benzimidazole in high yield with minimal side reactions. 1 H NMR and FTIR studies indicated that benzimidazoles could be efficiently synthesized in DMAc by reaction of an o-diamine and the bisulfite adduct of an aromatic aldehyde. Polymerizations were conducted at various polymer concentrations (2-26 wt % polymer) using difunctional monomers to optimize reaction conditions in DMAc which resulted in the preparation of high-molecular weight m-PBI (inherent viscosities up to 1.3 dL g 21 ). TGA and DSC confirmed that m-PBI produced via this route has comparable properties to that of commercial m-PBI. This method is advantageous in that it not only allows for high-polymer concentrations of m-PBI to be synthesized directly and efficiently, but can be applied to the synthesis of many PBI derivatives.

show abstract

Synthesis, Characterization, and Studies of Heat-Resistant Poly(ether benzimidazole)s

Cited by 35 publications

References 19 publications

A new sequence isomer of AB‐polybenzimidazole for high‐temperature PEM fuel cells

A new sequence isomer of AB‐polybenzimidazole for high‐temperature PEM fuel cells

Structure and properties of novel PMDA/ODA/PABZ polyimide fibers

Solution polymerization of polybenzimidazole

Contact Info

Product

Resources

About