Performance of layered birnessite-type manganese oxide in the thermal-catalytic degradation of polyamide 6

Eren, Erdal; Guney, Murat; Eren, Bi̇lge; Gümüş, Hüseyin

doi:10.1016/j.apcatb.2012.12.006

Cited by 20 publications

(12 citation statements)

References 41 publications

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“…64,65 Manganese oxides have been reported to be the most efficient solid acid for suppressing the recombination of macromolecular hydrocarbon radicals due to the presence of several acidic sites. 42,66 In this work, carbon numbers of pyrolysis products from the Ce-MnO2-GNS-EP composite also decreased compared with that of EP. Thus, this undoubtedly results from the catalytic degradation effect for EP by Ce-MnO2.…”

Section: Flame Retardant Mechanismmentioning

confidence: 81%

“…In comparison with neat EP, the T-5%, T-50% and Tmax of Ce-MnO2-EP nanocomposite were decreased because of the catalytic degradation of Ce-MnO2. 42 After introducing GNS into the EP matrix, the T -5% , T-50% and Tmax were slightly lower than that of the pure EP, which is attributed to the high heat conductivity of GNS. 43 However, it is found that the Ce-MnO2-GNS-EP nanocomposite demonstrates improved thermal stability with 4.6 o C, 8.8 o C and 8.9…”

Section: Resultsmentioning

confidence: 99%

“…Thus, this undoubtedly results from the catalytic degradation effect for EP by Ce-MnO2. 42,66 Moreover, degradation products with lower carbon numbers could extend the contacting time of with metal oxides catalyst under the physical barrier effect of GNS. With MnO2 catalyst, Hong et al used a simple method to synthesize multi-layer graphene flakes from pyrolyzing biodegradable poly(butylene succinate) composites.…”

Section: Flame Retardant Mechanismmentioning

confidence: 99%

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Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

et al. 2014

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Ce-doped MnO2-graphene hybrid sheets were fabricated by utilizing an electrostatic interaction between Ce-doped MnO2 and graphene sheets. The hybrid material was analyzed by a series of characterization methods. Subsequently, the Ce-doped MnO2-graphene hybrid sheet was introduced into an epoxy resin, and the fire hazard behaviors of the epoxy nanocomposite were investigated. The results from thermogravimetric analysis exhibited that the incorporation of 2.0 wt% of Ce-doped MnO2-graphene sheets clearly improved the thermal stability and char residue of the epoxy matrix. In addition, the addition of Ce-MnO2-graphene hybrid sheets imparted excellent flame retardant properties to an epoxy matrix, as shown by the dramatically reduced peak heat release rate and total heat release value obtained from a cone calorimeter. The results of thermogravimetric analysis/infrared spectrometry, cone calorimetry and steady state tube furnace tests showed that the amount of organic volatiles and toxic CO from epoxy decomposition were significantly suppressed after incorporating Ce-MnO2-graphene sheets, implying that this hybrid material has reduced fire hazards. A plausible flame-retardant mechanism was hypothesized on the basis of the characterization of char residues and direct pyrolysis-mass spectrometry analysis: during the combustion, Ce-MnO2, as a solid acid, results in the formation of pyrolysis products with lower carbon numbers. Graphene sheets play the role of a physical barrier that can absorb the degraded products, thereby extend their contact time with the metal oxides catalyst, and then promote their propagate on the graphene sheets; meanwhile pyrolysis fragments with lower carbon numbers can be easily catalyzed in the presence of Ce-MnO2. The notable reduction in the fire hazards was mainly attributed to the synergistic action between the physical barrier effect of graphene and the catalytic effect of Ce-MnO2.

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Section: Flame Retardant Mechanismmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Flame Retardant Mechanismmentioning

confidence: 99%

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Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

et al. 2014

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“…[51][52] m-SiO2 has been reported to be a most efficient solid acid for catalytic degradation of polymer due to the presence of many acid sites. [53][54] In this work, carbon numbers of pyrolysis products from the EP/m-SiO2@Co-Al LDH composite is also decreased compared with that of EP. Thus, this undoubtedly results from the catalytic degradation effect for EP by m-SiO2.…”

Section: Flame Retardant Mechanismmentioning

confidence: 76%

“…Thus, this undoubtedly results from the catalytic degradation effect for EP by m-SiO2. [53][54] Also, degradation products with lower carbon numbers could extend contacting time of with metal oxides catalyst under the labyrinth effect of m-SiO2. With different Co catalysts, Gong et al, used a simple method to synthesize carbon nanospheres through the carbonization of polystyrene.…”

Section: Flame Retardant Mechanismmentioning

confidence: 99%

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Jiang

Bai

Tang

et al. 2014

ACS Appl. Mater. Interfaces

146

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Hierarchical mesoporous silica@Co–Al layered double hydroxide (m-SiO2@Co–Al LDH) spheres were prepared through a layer-by-layer assembly process, in order to integrate their excellent physical and chemical functionalities. TEM results depicted that, due to the electrostatic potential difference between m-SiO2 and Co–Al LDH, the synthetic m-SiO2@Co–Al LDH hybrids exhibited that m-SiO2 spheres were packaged by the Co–Al LDH nanosheets. Subsequently, the m-SiO2@Co–Al LDH spheres were incorporated into epoxy resin (EP) to prepare specimens for investigation of their flame-retardant performance. Cone results indicated that m-SiO2@Co–Al LDH incorporated obviously improved fire retardant of EP. A plausible mechanism of fire retardant was hypothesized based on the analyses of thermal conductivity, char residues, and pyrolysis fragments. Labyrinth effect of m-SiO2 and formation of graphitized carbon char catalyzed by Co–Al LDH play pivotal roles in the flame retardance enhancement.

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Three‐Dimensional Pseudocapacitive Interface for Enhanced Power Production in a Microbial Fuel Cell

et al. 2015

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Interface properties are crucial to anodic extracellular electron transfer (EET) and power production of microbial fuel cells (MFCs), because they determine the local density of electroactive biofilms and the efficiency of electron transfer. To enhance MFC performance by improving EET, a 3D‐structured pseudocapacitive interface is created by in situ deposition of MnO2 on a carbon electrode through the redox reaction between permanganate and carbon. The electrochemical performance of the MnO2‐modified carbon paper electrode is increased considerably compared with an unmodified electrode, due to the increased local density of the exoelectrogenic biofilm and effective interfacial shuttling of electrons facilitated by the pseudocapacitive MnO2. The process for constructing 3D MnO2‐based interfaces is technologically simple, environmentally friendly, and cost‐effective. This study provides a new and promising strategy for improving power production in MFCs for scaled‐up applications.

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Performance of layered birnessite-type manganese oxide in the thermal-catalytic degradation of polyamide 6

Cited by 20 publications

References 41 publications

Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Three‐Dimensional Pseudocapacitive Interface for Enhanced Power Production in a Microbial Fuel Cell

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Performance of layered birnessite-type manganese oxide in the thermal-catalytic degradation of polyamide 6

Cited by 20 publications

References 41 publications

Fabrication of Ce-doped MnO2decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

Fabrication of Ce-doped MnO2decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Three‐Dimensional Pseudocapacitive Interface for Enhanced Power Production in a Microbial Fuel Cell

Contact Info

Product

Resources

About

Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism

Fabrication of Ce-doped MnO₂decorated graphene sheets for fire safety applications of epoxy composites: flame retardancy, smoke suppression and mechanism