Poly(ethylene oxide)-silicate intercalation materials

Aranda, Pîlar; Ruiz‐Hitzky, Eduardo

doi:10.1021/cm00024a048

Cited by 539 publications

(489 citation statements)

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“…It has been postulated for PEO intercalation compounds in transition-metal sulfides and other host solids such as silicates and vanadium pentoxide xerogels that the polymer can be arranged in the interlayer space of the 2D solid either with double-layer (zig-zag conformation) or with helical configuration of more or less distorted polyoxyethylene chains. [53][54][55][56][57][58] The observed increase of the basal spacing in these materials is ca. 0.8 nm and, in some cases, the PEO chains in monolayer disposition produce a basal spacing increase of ca.…”

Section: Pyridine-ta X Mo 1-x S 2 Intercalation Compoundsmentioning

confidence: 99%

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

Lara¹,

Ruiz²,

Manrı́quez³

et al. 2012

J. Braz. Chem. Soc.

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Este trabalho relata um estudo sistemático do comportamento estrutural e elétrico de três fases ternárias do sistema Ta x Mo 1-x S 2 (x = 0,55, 0,75 e 0,90) e de seus compostos de intercalação resultantes das inserções química e eletroquímica de lítio, assim como das intercalações de piridina e poli(óxido de etileno). As três fases foram preparadas pela reação direta de seus elementos constituintes, sem qualquer outro aditivo, a 900 o C em atmosfera inerte. Os compostos resultantes foram caracterizados por meio de difratometria de raios X de pó (XRD), análises termogravimétrica e térmica diferencial (TGA/DTA), fluorescência de raios X por dispersão de energia (EDX) e microscopia eletrônica de varredura com emissão de campo (FE-SEM). A condutividade elétrica dos diferentes compostos preparados foi medida no intervalo de temperatura 1,5-300 K utilizando o método convencional de sonda de quatro pontas van der Pauw na presença de um campo magnético de 9 T para verificar a ocorrência do fenômeno de magnetoresistividade.This work reports a systematic study of the structural and electrical behavior of three ternary phases of the Ta x Mo 1-x S 2 system (x = 0.55, 0.75 and 0.90) and their intercalation compounds resulting from both chemical and electrochemical lithium insertions, as well as from pyridine and poly(ethylene oxide) intercalations. The three ternary phases were prepared by direct reaction of their constituting elements, without any other additive, at 900 ºC in inert atmosphere. The resulting compounds were characterized by means of X-ray powder diffractometry (XRD), thermogravimetric and differential thermal (TGA/DTA) analyses, energy dispersive X-ray fluorescence (EDX) and field emission-scanning electron microscopy (FE-SEM). The electrical conductivity of the different products was measured in the 1.5-300 K temperature range using the conventional four probe van der Pauw method in the presence of a 9 T magnetic field in order to verify the occurrence of magnetoresistivity phenomena. Keywords: chalcogenides, intercalation, pyridine, PEO, conductivity IntroductionThe renewed interest to study layered solids is originated from the observation of unusual physical properties associated with anisotropy phenomena in such type of low-dimensional materials. Another important reason why 2D solids are investigated is their ability to intercalate a large variety of compounds. [1][2][3][4][5][6][7][8][9] In this context, physical properties such as electrical conductivity and electrochemical behavior of layered solids can be deliberately modified by intercalation of organic species. [2][3][4]10,11 Among different 2D solids, the study of layered transition-metal dichalcogenides (LTMDs) has become the subject of an active field of research in solid state physics and chemistry during the last decades. 1,12,13 One of the most salient physical properties of these materials is their electrical conductivity (and superconductivity) behavior, which is related to phase transitions usually driven by charge density wave mechanisms...

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Section: Pyridine-ta X Mo 1-x S 2 Intercalation Compoundsmentioning

confidence: 99%

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

Lara¹,

Ruiz²,

Manrı́quez³

et al. 2012

J. Braz. Chem. Soc.

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“…Therefore, in this pristine state, layered silicates are only miscible with hydrophilic polymers, such as poly(ethylene oxide) (PEO) (Aranda & Ruiz-Hitzky, 1992) or poly(vinyl alcohol) (PVA) (Strawhecker & Manias, 2000), (Yu et al, 2003). To render layered silicates miscible with hydrophobic polymer matrices, one must convert the normally hydrophilic silicate surface to an organophilic one, making the intercalation of polymer chains into inorganic galleries more effective.…”

Section: Structure Of Mmtmentioning

confidence: 99%

PVA / Montmorillonite Nanocomposites: Development and Properties

Sapalidis¹,

Katsaros²,

Kanellopoulos³

2011

Nanocomposites and Polymers With Analytical Methods

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“…According to the reports of Zampori et al [30], Finocchio et al [31], and Belova et al [32], PEG with the MW of 1500 (PEG1500) was used as a nonionic surfactant to prepare the organoclays. e PEG-intercalated clay had the ability to modify the clay's surface to be organophilic due to the interaction between the oxygen atoms of the PEG molecule and sodium cations dwelling in the interlayers of the layered silicate and between the PEG molecule and nanoclay surface via hydrogen bonding; hence, the long tails of the PEG molecular chain were able to interact with the organic polymer [12,15,33,34]. is process was similar to the conventional preparation of organoclay using small molecules of polar polymers instead of the general surfactant.…”

Section: Introductionmentioning

confidence: 99%

A Novel and Facile Nanoclay Aerogel Masterbatch toward Exfoliated Polymer‐Clay Nanocomposites through a Melt‐Mixing Process

Luecha

Magaraphan

2018

Advances in Materials Science and Engineering

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is research employed a novel and facile approach called nanoclay aerogel masterbatch.. is innovative technique was conducted by attaching the clay layers directly onto a mobile polymer, for example, polyethylene glycol (PEG), in order to modify the clay layer through PEG-clay intercalation and PEG-hydrogen bonding. is state was maintained with a small amount of the anionic polymer hydrogel, for example, kappa-carrageenan (KC), and turning it into a highly porous and fragile structure by freeze-drying, thus a so-called nanoclay aerogel masterbatch. e facile nanoclay aerogel masterbatch was able to be attained even at high clay loadings (55-67 wt.% of the inorganic clay content) with constant PEG and KC loadings. e interlayer spacing enlargement of the nanoclay galleries was around 17Å with the typical lamellar morphology like a house of cards structure. e density values were within 0.108-0.122 g·cm −3 . e thermal stabilities were up to 270°C, revealing better thermal stability for melt mixing with the commodity plastics at a high melting temperature. e flowability and processability were certified by the melt flow index (MFI) results. e highest nanoclay loading capacity (67 wt.%) of the achieved nanoclay aerogel masterbatch was selected to prepare PS-clay nanocomposites via a melt-mixing process. e comparative nanocomposites were produced by using organoclay. e results of the X-ray diffraction (XRD) and transmission electron microscopy (TEM) exhibited that the exfoliated morphologies were obtained at all clay contents (1-3 wt.%); however, the intercalated structure was gained by using organoclay.e outstanding transparency and brightness were remarked from the specimens prepared by using the nanoclay aerogel masterbatch. e brownish specimens were observed by using organoclay. e significant improvements of tensile properties, glass transition temperature (T g ), and thermal stability were noticed from the nanocomposites prepared using the nanoclay aerogel masterbatch.

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Poly(ethylene oxide)-silicate intercalation materials

Cited by 539 publications

References 3 publications

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

Intercalation and electrical behavior of Ta xMo1-xS2 (x > 0.5) layered mixed disulfides

PVA / Montmorillonite Nanocomposites: Development and Properties

A Novel and Facile Nanoclay Aerogel Masterbatch toward Exfoliated Polymer‐Clay Nanocomposites through a Melt‐Mixing Process

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