The thermal degradation of aromatic polysulphones

Danilina, L.I.; Teleshov, E.N.; Праведников, А.Н.

doi:10.1016/0032-3950(74)90380-3

Cited by 19 publications

(12 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The kinetic parameters were determined by using the arithmetic average activation energy of 77 kcal/mol at X = 0.1–0.7 for PES and 60 kcal/mol at X = 0.2–0.8 for PSF in this steady region to simplify the pyrolysis model. These values accorded well with those from previous reports1–6 and met the criteria of Ozawa's method for RT / E av ≪ 1 in the one‐stage pyrolysis region, from which the average activation energy was substituted into the following rearranged equation:13, 19, 20 where E av is the average activation energy (kcal/mol), A is the pre‐exponential factor (L/min), n is the reaction order, and T is the reaction temperature (K).…”

Section: Resultssupporting

confidence: 86%

“…SO 2 was the dominating pyrolysate in PES pyrolysis, but it was not accompanied by a sulfonic acid derivative. This result indicates main chain scission of sulfone linkages as the primary mechanism of pyrolysis, which had been reported earlier 1–7. In Figure 2a, SO 2 started to form at 440 °C, maintained slow evolution between 440 and 530 °C, then quickly reached a maximum at ∼560 °C, and drastically reduced after 580 °C.…”

Section: Resultssupporting

confidence: 82%

“…There have been numerous studies evaluating the degradation behavior of poly(arylene sulfone)s in the literature. Danilina et al1 used infrared (IR) analysis for the pyrolysates of PES and PSF, along with the change of absorption peaks for 2 h at 470 °C, showing the formation of SO 2 and phenol from the scission of sulfone and ether linkages. Crossland et al2 reported the results of thermogravimetry (TG) and pyrolysis/gas chromatography/mass spectrometry (Py‐GC/MS) in evaluating the pyrolysis mechanism and pyrolysates of various polysulfones, indicating main chain scission and hydrogen abstraction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of thermal degradation characteristics of poly(arylene sulfone)s using thermogravimetric analysis/mass spectrometry

Perng

2001

J of Applied Polymer Sci

View full text Add to dashboard Cite

Thermal degradation of poly(arylene sulfone)s had been studied by the combination of thermogravimetric analysis/mass spectrometry (TG/MS) with pyrolysis/ gas chromatography/mass spectrometry (Py-GC/MS) techniques. Through these two methods, the pyrolysates from poly(ether sulfone) (PES) and polysulfone (PSF) were identified in 11 and 21 sets of evolution curves, respectively, from room temperature to 900°C. Among these pyrolysates, 12 products from PES and 25 products from PSF were obtained. The major mechanism for both PES and PSF was one-stage pyrolysis involving main chain random scission and carbonization with evolution of SO 2 and phenol as major products. Although the initial thermal stability of PES was lower than that of PSF, the formation of sulfide groups in the condensed phase from PES, through reduction of sulfone group by hydrogen radicals, increased the fire retardation behavior of PES. In PES, the ether and sulfone groups showed similar thermal stability. The thermal stability of functional groups in PSF were in the order of sulfone Ͻ ether Ͻ isopropylidene group. The scission of the ether group in PSF, with evolution of phenol as the major product, reached maximum evolution amount at the temperature of the maximum thermogravimetry loss of TG (T max ). The scission of isopropylidene groups at high temperature (Ͼ580°C) evolved higher mass derivatives that lower the fire retardancy of PSF. By using a simplified kinetic model, PES showed maximum activation energy with a conversion ratio of 0.2-0.3, which implies a high fire retardant effect of sulfide formation in PES. A comparative study with the proposed model and experimental data showed the theoretical pyrolysis curves to be in agreement with the experimental curves for PES and PSF pyrolysis, respectively.

show abstract

Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of thermal degradation characteristics of poly(arylene sulfone)s using thermogravimetric analysis/mass spectrometry

Perng

2001

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Under flowing nitrogen, a single degradation process was observed in every case, followed by the formation of a stable residue. Several papers on the PES degradation are reported in the literature [28][29][30][31][32]. The primary degradation process of PES was attributed by Montaudo et al [33] to the thermal cleavage of two different bridged units, diphenylsulfone and diphenylether.…”

Section: Resultsmentioning

confidence: 99%

The influence of chain‐ends on the thermal and rheological properties of some 40/60 PES/PEES copolymers

Abate

Blanco

Cicala

et al. 2009

Polymer Engineering & Sci

View full text Add to dashboard Cite

Four random, differently ended (À ÀCl, À ÀNH 2 , À ÀOH, and À ÀCOO 2 ), polyethersulfone/polyetherethersulfone (PES/ PEES) copolymers were studied to investigate the influence of chain ends on thermal and rheological behaviors. The number average molar mass (M n % 9500 gÁmol 21 ) and the PES/PEES ratio (40/60) of all copolymers investigated were checked by 1 H NMR spectra. Thermal degradations were carried out in the scanning mode and initial decomposition temperatures (T i ) and activation energy values of degradation (E a ) were obtained. Glass transition temperature (T g ) was determined by differential scanning calorimetry and complex viscosity (g*) by rheological measurements in isothermal heating conditions (T ¼ 2708C). All parameters determined were largely affected by copolymer chain ends and decreased according to the same order, À ÀOH > À ÀNH 2 > À ÀCl > À ÀCOO 2 . The results were discussed and interpreted.

show abstract

“…The hypothesis that secondary reactions may occur was published in Magaril [6] for the case of the interaction of the phenyl radical with benzene. Calculations to estimate the activation energy of the addition of phenyl radicals to aromatic fragments of the macrochains of aromatic polysulphones showed that this quantity, E a , amounts to 33.4 kJ/mol, which indicates the possibility of the occurrence of this reaction at a high rate [7,8].…”

Section: Increase In the Content Of Oligoarylate Sulphone Block In Momentioning

confidence: 99%

Competing Processes Occurring at Different Stages of the Thermolysis of Poly(Arylate-Arylene Sulphonoxide) Block Copolymers

Shelgaev¹,

Gazaev²,

Zaikov³

et al. 2012

International Polymer Science and Technology

View full text Add to dashboard Cite

An investigation was made of the thermolysis of poly(arylate-arylene sulphonoxides) containing different amounts of oligoarylene sulphonoxide blocks in a wide temperature range in open and closed systems. It was established that, at relatively low temperatures, the main process of their transformation is structure formation of the polymer; at elevated temperatures (above 400°C), degradation processes predominate over structure formation. It was established that structure formation can be used as a method for increasing the thermal stability of the polymers investigated.

show abstract

The thermal degradation of aromatic polysulphones

Cited by 19 publications

References 6 publications

Comparison of thermal degradation characteristics of poly(arylene sulfone)s using thermogravimetric analysis/mass spectrometry

Comparison of thermal degradation characteristics of poly(arylene sulfone)s using thermogravimetric analysis/mass spectrometry

The influence of chain‐ends on the thermal and rheological properties of some 40/60 PES/PEES copolymers

Competing Processes Occurring at Different Stages of the Thermolysis of Poly(Arylate-Arylene Sulphonoxide) Block Copolymers

Contact Info

Product

Resources

About