The thermo-oxidative degradation of polystyrene

McNeill, I.C.; Razumovskii, L.P.; Gol'dberg, V.M.; Заиков, Г. Е.

doi:10.1016/0141-3910(94)90177-5

Cited by 24 publications

(7 citation statements)

References 9 publications

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“…The volatile products formed by degrading the hydro-peroxide groups are phenol, benzaldehyde and acetophenone [19]. In accordance with McNeill et al [20], the main products of PS thermo-oxidative degradation were styrene, CO2, H2O, benzaldehyde, αmethylstyrene, phenol, phenylacetaldehyde and acetophenone.…”

Section: Thermal and Thermo-oxidative Propertiessupporting

confidence: 78%

Application of Model-Free and Model-Based Kinetic Methods in Evaluation of Reactions Complexity during Thermo-Oxidative Degradation Process: Case Study of [4-(Hydroxymethyl)phenoxymethyl] Polystyrene Resin

Janković,

Dodevski,

Veljković

et al. 2024

Fire

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This work examined the possibilities and limitations of model-free and model-based methods related to decrypting the kinetic complexity of multi-step thermo-oxidative degradation processes (as a testing system, a [4-(hydroxymethyl)phenoxymethyl] polystyrene resin was used), monitored by thermal analysis (TGA-DTG-DTA) techniques. It was found that isoconversional methods could successfully determine the correct number of process stages and presence of multiple reactions based on derived Ea(α) profiles and identify the negative dependence of the rate constant on the temperature. These methods could not overcome the problem that arose due to mass transfer limitations. The model-based method overcame more successfully the problem associated with mass transfer because its calculation machinery had capabilities for the correct solution of the total mass balance equation. However, a perfect fit with the experimental data was not achieved due to the dependence on the thermal history of the contribution (ctb.) of a given reaction step inside a fitting procedure cycle. On the other hand, through this approach, it was possible to estimate the rate-controlling steps of the process regarding the influence of the heating rate. It was found that for consecutive reaction mechanisms, the production of benzaldehyde and gases in high yields was controlled by the heating rate, where low heating rates were strongly recommended (≤10 K/min). Also, it was shown that the transport phenomenon may be also the rate-determining step (within the set of “intrinsic” kinetic parameters). It was also established that external heat transfer controls the overall rate, where the “pure” kinetic control regime had not been reached but was approached when lowering the temperature and size of the resin particles.

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Section: Thermal and Thermo-oxidative Propertiessupporting

confidence: 78%

Application of Model-Free and Model-Based Kinetic Methods in Evaluation of Reactions Complexity during Thermo-Oxidative Degradation Process: Case Study of [4-(Hydroxymethyl)phenoxymethyl] Polystyrene Resin

Janković,

Dodevski,

Veljković

et al. 2024

Fire

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“…Volatile products formed by decomposing the hydroperoxide groups are phenol, benzaldehyde and acetophenone [166]. According to Mc Neil et al the main products of the thermo-oxidative degradation of polystyrene were styrene, carbon dioxide, water, benzaldehyde, α-methylstyrene, phenol, phenylacetaldehyde and acetophenone [168]. The thermo-oxidative degradation of polystyrene leads to chain scission, which result in β-scission reactions of alkoxy radicals comparable to the mechanism shown in Scheme 8.…”

Section: Polystyrenementioning

confidence: 99%

Review on the thermo-oxidative degradation of polymers during processing and in service

Gijsman

2008

E-Polymers

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“…The thermal and photodegradation of polystyrene in the presence of oxygen is well established [6][7][8][9]. The hydrogen bonded to the same carbon as the phenyl group is labile and its abstraction occurs by the absorption of energy producing a radical group [6,7] that suffers subsequent reactions such as depolymerisation and oxidation [8,9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical spectroscopy applied to study the thermal and photodegradation of poly(2,6-dimethyl-1,4-phenylene oxide)/high impact polystyrene blends

Saron

Felisberti

2004

Materials Science and Engineering: A

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The thermo-oxidative degradation of polystyrene

Cited by 24 publications

References 9 publications

Application of Model-Free and Model-Based Kinetic Methods in Evaluation of Reactions Complexity during Thermo-Oxidative Degradation Process: Case Study of [4-(Hydroxymethyl)phenoxymethyl] Polystyrene Resin

Application of Model-Free and Model-Based Kinetic Methods in Evaluation of Reactions Complexity during Thermo-Oxidative Degradation Process: Case Study of [4-(Hydroxymethyl)phenoxymethyl] Polystyrene Resin

Review on the thermo-oxidative degradation of polymers during processing and in service

Dynamic mechanical spectroscopy applied to study the thermal and photodegradation of poly(2,6-dimethyl-1,4-phenylene oxide)/high impact polystyrene blends

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