Pyrolysis–molecular weight chromatography–vapor‐phase infrared spectrophotometry: An on‐line system for analysis of polymers. III. Thermal decomposition of polysulfones and polystyrene

Kiran, Erdoǧan; Gillham, J. K.; Gipstein, Edward

doi:10.1002/app.1977.070210501

Cited by 40 publications

(22 citation statements)

References 11 publications

(2 reference statements)

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“…Twostep degradation processes with a minor but clear weight loss preceding the major step were published for other aliphatic polysulfones. 10 However, the first weight loss detected in those materials was much more significant than in 6. The degradation profile of 6 was therefore viewed as a one-step process.…”

Section: Scheme 2 Synthesis Of Polymers 4-6 Amentioning

confidence: 86%

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A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

Schmidt‐Winkel

Wudl

1998

Macromolecules

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A polar ester-functionalized aliphatic polysulfone with an odd-number of linking carbon atoms possessing remarkable thermal stability, degrading at 100°C above previously prepared polysulfones, was prepared in conjunction with the proposal of a novel concept for polar organic polymers. The synthesis involved polyaddition of vinyl sulfone and tert-butyl ethyl malonate in the presence of an amidine base and catalytic amount of water, followed by decarbo-tert-butoxylation. The polymers were characterized by infrared and nuclear magnetic resonance spectroscopies, elemental analysis, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis. Characterization results compared well with model compounds. Poly-decarbo-tert-butoxylation was achieved by exposure to trifluoroacetic acid, followed by treatment with copper(I) oxide, affording a soluble polar polysulfone, which could be cast into homogeneous films.

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Section: Scheme 2 Synthesis Of Polymers 4-6 Amentioning

confidence: 86%

“…8,9 Investigations of the thermal properties of aliphatic polysulfones through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were reported for even-numbered polysulfones. 10,11 However, to the best of our knowledge, odd-numbered aliphatic polysulfones have not been characterized by DSC and TGA to date.…”

Section: Introductionmentioning

confidence: 99%

A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

Schmidt‐Winkel

Wudl

1998

Macromolecules

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“…The thermal pyrolysis order of the chemical bonds on the polymer backbone is directly related to the bond energy [ 33 ]. As can be seen from Tables S3–S9 , the pyrolysis products produced by original silk and the treated silk are CO 2 because the bond splitting energy of the C–O bond in the molecular chain is the lowest (86.1 kcal/mol) [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

Synergistic Effects and Mechanism of Modified Silica Sol Flame Retardant Systems on Silk Fabric

Xing

Bingju

et al. 2018

Materials

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The nano-silica sol was prepared by sol-gel method, and the boric acid, urea, cyanoguanidine, melamine cyanurate (MCA), 1-hydroxyethane 1,1-diphosphonic acid (HEDP), and 6H-dibenz (C,E) (1,2) oxaphosphorin-6-oxide (DOPO) were added to the silica sol to modify the flame retardant through physical doping and chemical bonding. According to the formula proposed by Lewin, the calculation of flammability parameters were obtained by the limiting oxygen index meter, the micro calorimeter, the vertical burner, and the thermogravimetric analyzer proved that there was a synergistic or additive effect between the B/N/P flame retardant and the silica sol. Fourier transform infrared (FT-IR) spectrum, scanning electron microscopy, and pyrolysis gas chromatography-mass spectrometry were used to characterize the morphology, structure, and pyrolysis products of treated silk fabric and residues after combustion. The results show that the flame retardancy of silica-boron sol is mainly caused by endothermic reaction and melt covering reaction. Silicon-nitrogen sol acts as a flame retardant through endothermic reaction, release of gases, and melting coverage. Silicon-phosphorus sol achieves flame retardancy by forming an acid to promote formation of a carbon layer and melting coverage. Silica sol and other flame retardants show excellent flame retardanty after compounding, and have certain complementarity, which can balance the dosage, performance, and cost of flame retardants, and is more suitable for industrial development.

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“…is also considered [23]. For P(ESES-co-ESDPA) polymers, the chemical bond dissociation energies (BDE) of the different linkage in the polymer backbone are as follows [26,[38][39][40]: -C-COOH bond and consequent CO 2 scission, BDE = 66-71 kcal/mol; C-S bond, BDE = 55-60 kcal/mol; C-C bond, BDE = 80-85 kcal/mol; C-H bond, BDE = 90-100 kcal/mol; C-O bond, BDE = 86.1 kcal/mol. Therefore, on the basis of BDE values, the order of polysulfones bond breaking (weakest to strongest) can be the following: -C-COOH, Ph-SO 2 , Ph-O, Ph-C(CH 3 )-CH 2 , C-(CH 3 ), C-CH 2 and Ph-H. We believe that DPMS analysis gives pertinent information about the role of each bond in the pyrolysis pathways of the functionalized polysulfones studied.…”

Section: Direct Pyrolysis In Mass Spectrometrymentioning

confidence: 99%

Thermal Degradation Processes of Aromatic Poly(Ether Sulfone) Random Copolymers Bearing Pendant Carboxyl Groups

et al. 2020

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Thermal degradation processes of poly(ether sulfone) random copolymers having different molar amount of diphenolic acid (DPA) units were studied by direct-pyrolysis/mass spectrometry, stepwise pyrolysis-gas chromatography/mass spectrometry and thermogravimetric techniques. Results highlighted that thermal degradation processes occur in the temperature range from 370 to 650 °C, yielding a char residue of 32–35 wt%, which decreases as the mol% of DPA units rises. The pyrolysis/mass spectra data allowed us to identify the thermal decomposition products and to deduce the possible thermal degradation mechanisms. Thermal degradation data suggest that the decarboxylation process of the pendant acid moiety mainly occurs in the initial step of the pyrolysis of the copolymers studied. Successively, the scission of the generated isobutyl groups occurs in the temperature range between 420 and 480 °C. Known processes involving the main chain random scission of the diphenyl sulfone and diphenyl ether groups were also observed.

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Pyrolysis–molecular weight chromatography–vapor‐phase infrared spectrophotometry: An on‐line system for analysis of polymers. III. Thermal decomposition of polysulfones and polystyrene

Cited by 40 publications

References 11 publications

A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

Synergistic Effects and Mechanism of Modified Silica Sol Flame Retardant Systems on Silk Fabric

Thermal Degradation Processes of Aromatic Poly(Ether Sulfone) Random Copolymers Bearing Pendant Carboxyl Groups

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