Catalytic charring–volatilization competition in organoclay nanocomposites

Bellucci, Felipe Silva; Camino, Giovanni; Frache, Alberto; Sarra, A.

doi:10.1016/j.polymdegradstab.2006.11.006

Cited by 127 publications

(77 citation statements)

References 13 publications

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“…This is the consequence of the stepwise oxidation of surfactant cations, which proceeds easily for the cations bound to the surface of the sorbent by nonelectrostatic forces, and less easily for surfactant cations hidden in the pores of the mineral and interacting with the aluminosilicate skeleton via electrostatic forces. The decomposition of the surfactant follows a Hoffman elimination reaction [17,41,42] (with the formation of alkenes and ammonia). The presence of oxygen initializes the scission of C-H bonds in alkanes, ''departure'' of hydrogen atoms from the alkane structure and formation of alkenes, which are then rearranged into aromatic compounds and charcoal.…”

Section: Tg-dsc-qms Analysismentioning

confidence: 99%

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

Sternik

Gładysz–Płaska

Grabias

et al. 2017

J Therm Anal Calorim

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The influence of phosphate ions on the thermal stability of complexes obtained by adsorption of uranium(VI) on organobentonite was determined. Organoclay samples were prepared by the reaction of hexadecyltrimethylammonium bromide with bentonite. The isotherms of sorption/desorption of U(VI) from aqueous solutions containing phosphate ions onto different forms of bentonite were measured using the batch method. The highest amount of uranium was absorbed on HDTMAbentonite in the presence of phosphates. This may have been associated with the complexing of U(VI) ions by phosphate ions, which interacted with surfactant cations probably via electrostatic forces. A TG-DSC-MS study showed that the thermal decomposition of the surfactant sorbed on bentonite proceeded in two stages: at 200-400 and at 600-800°C. The first stage involved defragmentation and oxidation of surfactant cations present in the interior and on the surface of the mineral. The second stage involved oxidation of charcoal and simultaneous dehydroxylation of the sorbent. The oxidation of surfactant cations and the dehydroxylation of the mineral were suppressed in the presence of phosphates.

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Section: Tg-dsc-qms Analysismentioning

confidence: 99%

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

Sternik

Gładysz–Płaska

Grabias

et al. 2017

J Therm Anal Calorim

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“…The distributions of all gaseous products of ALAinter-Mt(Na) with respect to temperature. et al (2001) and Bellucci et al (2007) reported that alkylammoniummodified montmorillonite was likely to undergo Hoffmann elimination during the heating process, resulting in the formation of ammonia and the corresponding alkene. The generation of NH 3 during the thermal degradation of ALA inter -Mt(Na) can be attributed to two reasons.…”

Section: Evolved Gas Analysismentioning

confidence: 99%

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Liu

Yuan

Qin

et al. 2013

Applied Clay Science

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“…Usually the organic modifiers of layered silicates are alkylammonium salts which thermal degradation takes place in one step in a short temperature range (250-350°C) [17], whereas Fig. 10.2 shows that the alkylammonium ions intercalated between the clay layers, decompose to volatile compounds in more than one step and in a larger temperature range (e.g.…”

Section: Thermal Degradation Of Clays and Organoclaysmentioning

confidence: 99%

“…10.2 shows that the alkylammonium ions intercalated between the clay layers, decompose to volatile compounds in more than one step and in a larger temperature range (e.g. 200-500°C) [10,11,[17][18][19]. These differences are explained by the interaction clay-organic compound and they help in understanding the thermal behaviour of clay-organic polymer nanocomposites.…”

Section: Thermal Degradation Of Clays and Organoclaysmentioning

confidence: 99%

“…The first event of decomposition is usually due to the unconfined fraction of alkylammonium, that consists of alkylammonium surfactant which has not undergone the ion exchange reaction and is either complexed on the outer surface of the clay or within void spaces between primary particles or inside the interlayer space but in a peripheral position [10,[17][18][19]. This behaviour shows that the Lewis and/or Brønsted acid sites behave as catalytic sites affecting the initial stage of decomposition of the alkylammonium molecules accelerating the carbon-carbon bond scission at high temperature.…”

Section: Thermal Degradation Of Clays and Organoclaysmentioning

confidence: 99%

See 1 more Smart Citation

Flammability and Thermal Stability in Clay/Polyesters Nano-Biocomposites

Bocchini

Camino

2012

Environmental Silicate Nano-Biocomposites

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In these years we are witnessing the growth of the biopolymers durable application markets such as buildings, transportation, electronic equipments etc. Thus, the fire retardancy issue is becoming important and it is expected that in the next future more and more research will be devoted to the subject. So far, a limited number of papers reports on flame retardant properties of biopolyesters and they are mainly on polylactide. Most of the papers published on this topic regarding biopolyesters, concern polyesters fire retarded by traditional fire retardants developed for oil sourced polymers, especially polyesters such as polyethylene terephthalate or other polymers such as polycarbonate. The recently developed use of nanoclays to fire retard polymers has proved to be beneficial also for polyesters from renewable resources. This chapter reviews the studies published on thermal and fire behaviour of polylactide nanocomposites based on clays. Indeed, PLA is the most important commercial plastic from renewable resources (RRP) polyester for which durable applications are being developed and fire retardant aspects are investigated. IntroductionFirst applications of biopolyesters were designed for disposable materials (e.g. packaging) where flame retardancy is not required. In the last years the bioplastics are experiencing a rapid growth with 38 % annual average growth rate

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Catalytic charring–volatilization competition in organoclay nanocomposites

Cited by 127 publications

References 13 publications

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Flammability and Thermal Stability in Clay/Polyesters Nano-Biocomposites

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