Preparation and Characterization of Nitrated Poly(Aryl Ether Ketone)

Karcha, Robert J.; Porter, Roger S.

doi:10.1080/10601329508009339

Cited by 9 publications

(9 citation statements)

References 21 publications

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“…Cui and Kerees performed the amination of PEEK by dissolution of the nitro compound in DMF with further addition of a solution of Na 2 S 2 O 4 in water and HCl. [7][8] Another study with amination on the carbonyl group is given in reference.…”

Section: Preparation Of Nh 2 -Peekmentioning

confidence: 99%

“…Karcha et al performed the nitration of PEEK to different degrees, by dissolution in methane sulfonic acid and addition of nitric acid. 8 Cui and Kerres described the nitration of PEEK and other aryl polymers by PEEK dissolution in concentrated sulfuric acid, followed by gradual addition of nitric acid. 9,10 The method used in this study is easier and cleaner than these methods described in the literature, since the reaction occurs without dissolution of the polymer.…”

Section: Preparation Of No 2 -Peekmentioning

confidence: 99%

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Preparation and characterization of poly(ether ether ketone) derivatives

Conceição¹,

Bertolino²,

Barra³

et al. 2008

J. Braz. Chem. Soc.

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Neste trabalho, três derivados do poli(éter éter cetona) [PEEK] foram preparados em suspensão por meio da nitração, redução para o grupo amino e redução da carbonila. Os polímeros modificados foram caracterizados por espectroscopia de infravermelho (FTIR), Ressonância Magnética Nuclear (NMR), análise termogravimétrica (TGA) e apresentaram características interessantes para a preparação de membranas e compósitos, tais como, basicidade e solubilidade em solventes orgânicos, como DMF.In this study, three derivatives of poly(ether ether ketone) [PEEK] were prepared in suspension by nitration (NO 2 -PEEK), reduction to the amino group (NH 2 -PEEK) and carbonyl reduction (PEEK-OH). These modified polymers were characterized by NMR, IR spectroscopy and thermogravimetric analysis. They showed interesting characteristics, such as, basicity and higher solubility in organic solvents, like DMF, for use as membranes and composites in different applications.

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Section: Preparation Of Nh 2 -Peekmentioning

confidence: 99%

Section: Preparation Of No 2 -Peekmentioning

confidence: 99%

Preparation and characterization of poly(ether ether ketone) derivatives

Conceição¹,

Bertolino²,

Barra³

et al. 2008

J. Braz. Chem. Soc.

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“…To date, dissolution of PEEK has been reported in concentrated acids such as sulfuric acid, chlorosulfonic acid, hydrofluoric acid, methanesulfonic acid, trichloromethanesulfonic acid, trifluoromethanesulfonic acid, polyphosphoric acid, dichloroacetic acid, and a mixture of trichloroacetic acid with 1,1,2,2-tetrachloroethane . Limited solubility requiring elevated temperatures has also been reported in high boiling point solvents including: benzophenone, , 4-chlorophenol, diphenyl sulfone, α-chloronapthalene, sulfolane, and a mixture of phenol and 1,2,4-trichlorobenzene …”

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confidence: 99%

Thermoreversible Gelation of Poly(ether ether ketone)

2017

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Solutions of poly(ether ether ketone) in dichloroacetic acid have been shown to form monolithic, thermoreversible gels at temperatures ranging from 10 to 140 °C. A phase diagram was constructed over broad concentration and temperature ranges, and the phase boundary suggests an upper critical solution temperature (UCST) behavior. Furthermore, poly(ether ether ketone) (PEEK) gels were solvent-exchanged with water to form hydrogels and subsequently lyophilized to form PEEK aerogels. The PEEK aerogels of density 0.2 g/mL were found to be highly porous and composed of uniform 200 nm morphological features. The crystal structure of the PEEK hydrogels and aerogels was found to be identical to that of melt-crystallized PEEK. The mechanical properties of the PEEK aerogels (in compression) were found to be superior to conventional silicate aerogels of comparable density. This report is the first example of a monolithic, thermoreversible gel of PEEK and the first demonstration of PEEK hydrogels and aerogels.

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“…On the other hand, T g was decreased in nitrated SPEEK; 165 • C, 155 • C, and 150 • C for S63N17, S63N22, and S63N38, respectively. The incorporation of a nitro group would lower the T g values, but was thought not to be involved in the intermolecular interaction [18].…”

Section: Thermal Characteristicsmentioning

confidence: 99%

“…Before the amination reaction, the polymer was prepared by nitration using nitric acid and sulfonic acid in nitrobenzene. Karcha and Porter [18] prepared nitrated poly(ether ether ketone) (PEEK-NO 2 ) by dissolving PEEK in methanesulfonic acid and subsequently nitration in concentrated nitric acid.…”

Section: Introductionmentioning

confidence: 99%