Effect of the catalyst MCM-41 on the kinetic of the thermal decomposition of poly(ethylene terephthalate)

Araújo, Sulene Alves; Araújo, Antônio S.; Fernandes, Nedja Suely; Fernandes, Valter J.; Ionashiro, Massao

doi:10.1007/s10973-009-0490-9

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…This could have been the result of (1) a catalytic effect of the larger MCM-41 agglomerates on the PC degradation and/or (2) the creation of more free volume for the diffusion of volatile degradation products out of the sample. Araujo et al [18] and Motaung et al [32] attributed similar observations to a catalytic effect of the filler on polymer degradation. MCM-41 can be used as a catalyst because of its large surface areas, ordered pore structures and readily controlled pore diameters.…”

Section: Thermal Degradationmentioning

confidence: 77%

Morphology, interfacial interaction, and thermal degradation of polycarbonate/MCM-41 (nano)composites

Sibeko

Luyt

Saladino

et al. 2017

International Journal of Polymer Analysis and Characterization

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This article reports on the morphology, interfacial interaction, thermal stability, and thermal degradation kinetics of polycarbonate (PC)/mesoporous silica (MCM-41) composites with various MCM-41 contents, prepared by melt compounding. The composites with low filler loadings (<0.3 wt%) maintained their transparency because of the well dispersed MCM-41 particles, but at higher filler loadings the composites lost their transparency due to the presence of agglomerates. The presence of agglomerates decreased the thermal stability of PC due to the reduced effectiveness of the particles to immobilize the polymer chains, free radicals, and volatile degradation products

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Section: Thermal Degradationmentioning

confidence: 77%

Morphology, interfacial interaction, and thermal degradation of polycarbonate/MCM-41 (nano)composites

Sibeko

Luyt

Saladino

et al. 2017

International Journal of Polymer Analysis and Characterization

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“…These evaluations were carried out by thermogravimetry. This method has been widely applied for degradation of heavy oil [13] and pyrolysis of polyethylene [14][15][16][17]. The VGO corresponds to the residue stream obtained in the vacuum distillation of the residue generated at the atmospheric distillation of crude oil.…”

Section: Microporous and Mesoporous Materialsmentioning

confidence: 99%

Development of HZSM-5/AlMCM-41 hybrid micro–mesoporous material and application for pyrolysis of vacuum gasoil

Coriolano

Silva²,

Costa

et al. 2013

Microporous and Mesoporous Materials

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“…This can be attributed to the catalytic effect of the filler, which probably increased the initiation rate through the trapping of the polymer chains in the MCM-41 pores. Araujo et al [25] reported a similar catalytic effect of MCM-41, where they observed that the activation energy of poly(ethylene terephthalate) (PET) decreased from 231 to 195 kJ mol −1 in the presence of MCM-41. For our previously reported melt mixed samples [17], the activation energy values of the composites at 0.5 wt.% were found to be significantly higher than those of the neat PMMA.…”

Section: Thermogravimetric Analysis and Thermal Degradation Kineticsmentioning

confidence: 83%

“…PMMA is an amorphous polymer, and as expected, its SAXS pattern does not display any peak in the investigated scattering intensity I(Q) range. As for the SAXS pattern of MCM-41, a high-intensity peak at 0.15 Å −1 (100) and two low-intensity reflections ((110) and ( 200)) were observed, which correspond to the typical hexagonal structure of MCM-41 [25].…”

Section: Small-angle X-ray Scatteringmentioning

confidence: 87%

Effect of preparation method on the properties of poly(methyl methacrylate)/mesoporous silica composites

et al. 2019

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The preparation method of a polymer composite and the filler loading are amongst the factors that influence the properties of the final composites. This article studies the effect of these factors on the thermal stability and thermal degradation kinetics of poly(methyl methacrylate) (PMMA)/mesoporous silica (MCM-41) composites filled with small amounts of MCM-41. The PMMA/MCM-41 composites were prepared through in situ polymerisation and melt mixing methods, with MCM-41 loadings of 0.1, 0.3, and 0.5 wt.%. The presence of MCM-41 increased the thermal stability of PMMA/MCM-41 composites prepared by melt mixing, but in the case of the in situ polymerised samples, the MCM-41 accelerated the degradation of the polymer. As a result, the activation energy was low and less energy was required to initiate and propagate the degradation process of these composites. The small-angle X-ray scattering (SAXS) measurements showed that the preparation method of the composites had no influence on the pore size of MCM-41, but the PMMAs used in the two methods both had shorter chains than the MCM-41 pore size. This allowed the polymer chains to be trapped inside the pores of the filler and be immobilised, as was observed from nuclear magnetic resonance (NMR) spectroscopy. The immobilisation of the polymer chains was more significant in the in situ polymerised samples.

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Effect of the catalyst MCM-41 on the kinetic of the thermal decomposition of poly(ethylene terephthalate)

Cited by 13 publications

References 17 publications

Morphology, interfacial interaction, and thermal degradation of polycarbonate/MCM-41 (nano)composites

Morphology, interfacial interaction, and thermal degradation of polycarbonate/MCM-41 (nano)composites

Development of HZSM-5/AlMCM-41 hybrid micro–mesoporous material and application for pyrolysis of vacuum gasoil

Effect of preparation method on the properties of poly(methyl methacrylate)/mesoporous silica composites

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