Thermal-oxidative induced degradation behaviour of polyoxymethylene (POM) copolymer detected by TGA/MS

Lüftl, Sigrid; Archodoulaki, Vasiliki‐Maria; Seidler, Sabine

doi:10.1016/j.polymdegradstab.2005.01.029

Cited by 96 publications

(68 citation statements)

References 11 publications

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“…80 kJ/ mol, which was signifi cantly lower than that for the thermal degradation (ca. 110 kJ/mol) [76]. A decrease of initial decomposition temperature was also reported by Wang et al for POM modifi ed with acid-treated CNTs [5].…”

Section: Th Ermal Stability Of Pom Modifi Ed With Nanofi Llersupporting

confidence: 73%

Nanocomposites of Polyoxymethylene

Leszczyńska¹,

Pielichowski²

2014

Polyoxymethylene Handbook

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Recent research results in the area of nanocomposites and nanostructured materials based on polyoxymethylene (POM) are reviewed in this chapter. Improvement of diff erent properties, such as mechanical strength, electrical conductivity, tribological properties, thermal stability and biocompatibility, are reported for these new POM-based materials, which indicate their high potential in structural and functional applications. As nanofi llers for POM-layered silicates, fullerenes, carbon nanotubes and nanofi bers, polysilsesquioxanes (POSS), nanostructural hydroxyapatite or nanoparticulate oxides such as titanium dioxide, nanosilica, zirconium oxide and zinc oxide, are applied. Nanocomposites based on POM and diff erent types of nanofi llers reveal superior properties compared to conventional POM composites, but the amount of additive remains lower. Th e infl uence of nanofi ller type, manufacturing techniques, role of interfacial properties and kind of applied surface modifi cation of nanoparticles on the control of generated nanostructure is discussed. Moreover, complex morphology and properties of electrospun POM nanofi bers are analyzed with respect to the nanomaterials manufacturing conditions.

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Section: Th Ermal Stability Of Pom Modifi Ed With Nanofi Llersupporting

confidence: 73%

Nanocomposites of Polyoxymethylene

Leszczyńska¹,

Pielichowski²

2014

Polyoxymethylene Handbook

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“…Peak m/z 44 could also correspond to carbonyl, carboxyl or hydroperoxide groups formed in the main chain during thermooxidative degradation [8,37,39] which can induce chain scission followed by the formation of formaldehyde, but they can also oxidize the latter to formic acid. The both reactions are responsible for acidolytic degradation of the polyacetal chain [5].…”

Section: Resultsmentioning

confidence: 99%

“…One of the main methods of improving thermal stability of POM is copolymerization with thermally stable monomers (e.g., ethylene oxide, dioxolane, dioxepane). Introduction of comonomer unit reduces the degradation sensitivity because the driving processes are decelerated and even stopped at the first comonomer unit [5]. However, these comonomer units strongly affect the thermal and chemical behavior of the copolymer.…”

Section: Introductionmentioning

confidence: 99%

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

Pielichowska

2015

J Therm Anal Calorim

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In this paper, the influence of mass-average molar mass (M w ) of polyoxymethylene (POM) copolymer on the thermooxidative degradation behavior of its nanocomposites with hydroxyapatite (HAp) is reported. POM copolymers' thermal stability slightly decreases with a decrease in mass-average molar mass. Thermal stability of POM/HAp nanocomposites is lower in comparison with pure POM, and it gets lower with a decrease in massaverage molar mass of POM copolymer. For POM copolymer with the highest molar mass, thermal stability of POM/HAp nanocomposite was ca. 30°C lower than for pure POM. To get a more in-depth insight into the decomposition process, kinetic analysis of POM/HAp nanocomposite thermal degradation process was performed using Friedman, Ozawa-Flynn-Wall and multiple nonlinear regression methods. The best fit for pristine T2, T3 and T4 copolymers with different molar mass of 100768, 74727 and 68377 g mol -1 , respectively, was obtained for onestage degradation mechanism with autocatalysis, while for T2/10 % HAp and T3/10 % it was parallel reaction model with autocatalysis (Bna) and phase-boundary reaction models (R3). For T4/10 % HAp, the best approximation was found for R2-Bna-D3 reaction model. From hyphenated TG-MS and TG-FTIR thermoanalytical studies, it was found that the main degradation product for POM/HAp nanocomposites is formaldehyde and the amount of other degradation products is lower in comparison with nonmodified POM copolymers.

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“…The main degradation mechanism of the degradation of polyacetals during processing is due to depolymerization and not due to oxidation [142,143].…”

Section: Polyacetals -Degradation During Processingmentioning

confidence: 99%

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

Gijsman

2008

E-Polymers

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Thermal-oxidative induced degradation behaviour of polyoxymethylene (POM) copolymer detected by TGA/MS

Cited by 96 publications

References 11 publications

Nanocomposites of Polyoxymethylene

Nanocomposites of Polyoxymethylene

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

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

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