Elucidating the catalytic effect of metal ions in montmorillonite on thermal degradation of organic modifier

Zope, Indraneel Suhas; Dasari, Aravind; Camino, Giovanni

doi:10.1016/j.matchemphys.2015.03.015

Cited by 12 publications

(13 citation statements)

References 35 publications

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“…Metal ions can accelerate the generation of these intermediate reactive moieties, and also influence oxidative stability of the char (depending on their redox potential, concentration and chelation) [19,[23][24][25]. We found this to be valid as significantly varying effects for different metal ion exchanged clays, depending on principle metal ion (Mg 2+ , Al 3+ or Fe 3+ ), were observed on decomposition onset of organic modifier and oxidative stability of carbonaceous matter [26]. Each metal ion enriched clay exhibited unique Brønsted acidity and Lewis acidity, which subsequently altered decomposition mechanism of organic modifier.…”

Section: Introductionmentioning

confidence: 95%

“…Sodium MMT, commercially known as Cloisite Na + , was procured from BYK-Chemie GmbH. Cloisite Na + has a mean formula unit of Na 0.65 [Al,Fe] 4 Si 8 O 20 (OH) 2 and cation exchange capacity, CEC, of 92 meq/100 g. Preparation of metal ion exchange clays (MI-clays) and organically modified MIclays (OMI-clays) using hexadecyltrimethylammonium ion is reported earlier [26].…”

Section: Materials and Synthesis Proceduresmentioning

confidence: 99%

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Influence of metal ions on thermo-oxidative stability and combustion response of polyamide 6/clay nanocomposites

Zope

Dasari

Guan

et al. 2016

Polymer

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Section: Introductionmentioning

confidence: 95%

Section: Materials and Synthesis Proceduresmentioning

confidence: 99%

Influence of metal ions on thermo-oxidative stability and combustion response of polyamide 6/clay nanocomposites

Zope

Dasari

Guan

et al. 2016

Polymer

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“…However, with the exception of a few reports [ 3 , 4 ], the majority of the studies on flammability of polymer/clay nanocomposites have reported an earlier ignition behavior compared to their corresponding neat polymers [ 2 ]. It is known that the reactivity of smectite clays such as montmorillonite is affected by replacing the relatively mobile and exchangeable cationic species, such as Na + or Ca 2+ , on their surfaces by higher valence metal ions, such as Mg 2+ , Zn 2+ , Cu 2+ , Al 3+ or Fe 3+ [ 5 , 6 , 7 , 8 ]. In fact, this attribute has been exploited for applications like catalysis [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, this attribute has been exploited for applications like catalysis [ 9 , 10 ]. In our recent systematic investigations on this topic [ 7 , 11 ], we showed that by amplifying the content of a specific cation (which are inherently present in the clay structure), thermal decomposition and combustion reactions of PA6 could be affected. For instance, Al 3+ -rich PA6/clay nanocomposites ignited early with a lower onset temperature of decomposition under oxidative conditions; while an Mg 2+ -rich composite displayed the maximum thermo-oxidation stability and gave the highest residue.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymer-Clay Interfacial Interactions on the Ignition Time of Polymer/Clay Nanocomposites

Zope

Dasari

2017

Materials

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Metal ions present on smectite clay (montmorillonite) platelets have preferential reactivity towards peroxy/alkoxy groups during polyamide 6 (PA6) thermal decomposition. This changes the decomposition pathway and negatively affects the ignition response of PA6. To restrict these interfacial interactions, high-temperature-resistant polymers such as polyetherimide (PEI) and polyimide (PI) were used to coat clay layers. PEI was deposited on clay by solution-precipitation, whereas PI was deposited through a solution-imidization-precipitation technique before melt blending with PA6. The absence of polymer-clay interfacial interactions has resulted in a similar time-to-ignition of PA6/PEI-clay (133 s) and PA6/PI-clay (139 s) composites as neat PA6 (140 s). On the contrary, PA6 with conventional ammonium-based surfactant modified clay has showed a huge drop in time-to-ignition (81 s), as expected. The experimental evidences provided herein reveal the role of the catalytic activity of clay during the early stages of polymer decomposition.

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“…Introducing silver nanoparticles (Ag NPs) into conventional polymers induce antimicrobial properties and results in new materials with enhanced properties. Clay‐silver hybrid nanocomposites offers a unique combination in antimicrobial, thermal stability, improved gas barrier properties and fire resistance . It is an important challenge, the effective incorporation of metal and clay nanoparticles into a polymeric matrix, because these particles tend to agglomerate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Compatibilizer on Polyethylene/Clay/Silver Nanocomposite Properties

Sánchez-Valdés

Ibarra-Alonso

Ramı́rez-Vargas

et al. 2017

Macromolecular Symposia

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Polyethylene grafted with maleic anhydride (PEgMA) was used as one type of compatibilizer and it was reacted by reactive extrusion with 2 [2 (dimethyl‐amine) ethoxy] ethanol (DMAE) to obtain other type of compatibilizer PEgDMAE. Synthesis and deposition of silver nanoparticles (Ag‐NP) was done by two different methods: In one method (method A), silver nanoparticles were synthetized using ethylene glycol (EG) and pre mixed with compatibilizers using ultrasound with the aim of inducing an interaction between AgNP and polar groups of compatibilizer. Then they were incorporated in a blend with PE and Clay by melt mixing. In other method (method B) silver nanoparticles, were synthetized using EG, premixed with the Clay in a solvent suspension, and then incorporated with PE and compatibilizers. Characterization techniques indicated that an increase in the content of Ag‐NPs, filler dispersion (clay and silver), mechanical and antimicrobial properties were strongly affected by the type and concentration of the compatibilizer and preparation method used. The using of PEgDMAE resulted in a better particle distribution of both sliver and clay into PE. The obtained nanocomposites showed enhanced mechanical and antimicrobial properties with highly exfoliated and dispersed filler into the PE matrix that offers a better option for obtaining hybrid nanocomposites for different applications.

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Elucidating the catalytic effect of metal ions in montmorillonite on thermal degradation of organic modifier

Cited by 12 publications

References 35 publications

Influence of metal ions on thermo-oxidative stability and combustion response of polyamide 6/clay nanocomposites

Influence of metal ions on thermo-oxidative stability and combustion response of polyamide 6/clay nanocomposites

Influence of Polymer-Clay Interfacial Interactions on the Ignition Time of Polymer/Clay Nanocomposites

Effect of Compatibilizer on Polyethylene/Clay/Silver Nanocomposite Properties

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