Thermal cracking characteristics of PEEK under different environments by the TG/FTIR technique

Perng, Li‐Hsiang

doi:10.1002/(sici)1099-0518(19991215)37:24<4582::aid-pola15>3.0.co;2-q

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…The amount of residue is high and reaches about 50% at 800°C. The decay in inert gas usually involves the release of hydrogen and low molecular weight hydrocarbons originating from aliphatic regions while the aromatic segments upon carbonization form char residue . The dominating contribution of aromatic rings in PEEK results in the exceptionally high content of char.…”

Section: Resultsmentioning

confidence: 99%

“…The decay in inert gas usually involves the release of hydrogen and low molecular weight hydrocarbons originating from aliphatic regions while the aromatic segments upon carbonization form char residue. 10 The dominating contribution of aromatic rings in PEEK results in the exceptionally high content of char. Detected residues can be interpreted in terms of pyrolysis leading to carbonization that is promoted by high amount of aromatic rings what was in the past confirmed by Yin et al 30…”

Section: Thermogravimetric Analysis In Inert Gas (Tga)mentioning

confidence: 99%

“…Heiland et al estimated, without identifying the resulting products, that radical yield of gamma‐irradiated PEEK (77 K, 5 kGy/h) was 0.16 × 10 −7 mol/J . Several other works concerned changes in thermal and tensile properties of irradiated aromatic polymers …”

Section: Introductionmentioning

confidence: 99%

“…7 Several other works concerned changes in thermal and tensile properties of irradiated aromatic polymers. [8][9][10][11] So far comprehensive studies on radical processes in irradiated PEEK based on thermal annealing and microwave saturation effects observed by EPR spectroscopy have not yet been performed. Analysis of the results appears to be a promising way to understand the macroscopic consequences of these phenomena.…”

Section: Introductionmentioning

confidence: 99%

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Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Kornacka

Przybytniak

Nowicki

2018

Polymers for Advanced Techs

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Poly (ether ether ketone) was irradiated with gamma rays or electron beam to investigate the radical process. The generated paramagnetic species were observed by electron spin resonance spectroscopy at ambient temperature and in liquid nitrogen. The effect of microwave power on saturation of the particular spectra and thermal annealing effects were determined. The following radicals were identified: radical anion, phenoxyl radical, and phenylperoxy radical. Despite the fact that the intermediates were formed as a result of backbone cleavage causing degradation, the macroscopic features were almost unaffected by irradiation up to dose of 1500 kGy.

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Section: Resultsmentioning

confidence: 99%

Section: Thermogravimetric Analysis In Inert Gas (Tga)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Kornacka

Przybytniak

Nowicki

2018

Polymers for Advanced Techs

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“…The process is enhanced by lower heating hates, which permits greater diffusion of oxygen through the melt [6][7][8][9] . The thermogravimetric analysis has been widely used as a method for investigate the thermal decomposition of polymers and for determine their thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis

et al. 2013

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The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposition kinetics of the polymer poly (ether ether ketone) (PEEK) was evaluated in nitrogen and synthetic air atmospheres, using the Flynn-Wall-Ozawa and Coats Redfern models. The results showed that the necessary time for the material decomposes in 5% is approximately 216 years if it is submitted to temperatures of 350 °C in nitrogen atmosphere. On the other hand, if the material is submitted to air atmosphere, this decomposition time drops to about 1,05 years in the same temperature and for the same conversion rate. The decomposition kinetics study by Coats Redfern showed that the D3 mechanism (three-dimensional diffusion (Jander equation)) had better adjustment to the decomposition kinetics of the material in nitrogen atmosphere, while in synthetic air the R1 mechanism (phase boundary controlled reaction (one-dimensional movement)) has better adjustment to the decomposition kinetics of the material.

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Preparation and characterization of novel basic polysulfone polymers

Kerres

Ullrich

Hein

2001

J. Polym. Sci. A Polym. Chem.

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Two synthesis routes for the preparation of novel base-modified polysulfones (PSUs; Udel) were investigated: (1) the addition of the basic aromatic ketones 2,2Ј-dipyridylketone and 4,4Ј-bis-(diethylamino)benzophenone and the basic aromatic aldehydes N,N-dimethylamino-benzaldehyde, pyridine-2-aldehyde, pyridine-3-aldehyde, and pyridine-4-aldehyde to lithiated PSU and (2) the reaction of lithiated PSU with basic aromatic carboxylic acid esters such as 4-N,N-dimethylaminobenzoic acid ethylester, pyridine-2-carboxylic acid ethylester, pyridine-3-carboxylic acid ethylester, and pyridine-4-carboxylic acid ethylester. Both synthesis routes lead to a high degree of conversion, without the occurrence of crosslinking. This is remarkable, especially for the reaction of lithiated PSU with the ester compounds, because the O(CAO)OAr groups formed by the reaction of the ester with PSU-Li are not further converted with the remaining PSU-Li sites to (crosslinked) PSUOC(OOLi)OArOPSU alcoholates, as normally observed when esters are reacted with Li-organic compounds. Starting with dilithiated PSU, we obtained degrees of substitution of 0.8 -2 groups per PSU repeating unit. The structures and compositions of the modified PSU polymers were confirmed with NMR spectroscopy and elemental analysis. The modified polymers were also characterized via thermogravimetric analysis (thermal stability). Interestingly, the product of the reaction of lithiated PSU with 4,4Ј-bis-(diethylamino)benzophenone could be oxidized to a deep blue polymeric dye that showed proton self-conductivity.

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Thermal cracking characteristics of PEEK under different environments by the TG/FTIR technique

Cited by 12 publications

References 19 publications

Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis

Preparation and characterization of novel basic polysulfone polymers

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