On the Nature of Polyimide-Clay Hybrid Composites

Lan, Tie; Kaviratna, Padmananda D.; Pinnavaia, Thomas J.

doi:10.1021/cm00041a002

Cited by 547 publications

(357 citation statements)

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“…The dramatic lowering of permeability in the nanocomposites is due to the presence of dispersed large aspect ratio silicate layers in the polymer matrix as seen in other polymer-layered silicate composites. [26][27][28]61,62 The solvent casting technique used here to form the nanocomposite films can result in in-plane orientation of the silicate layers, which are impermeable to water molecules. This forces solutes traversing the film to follow a tortuous path through the polymer matrix surrounding the silicate particles, thereby increasing the effective path length for diffusion.…”

Section: C1-h3n+rc02[c(=o)(ch2)60]n+1h + Li+ -Mts (4)mentioning

confidence: 99%

Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites

Messersmith

Giannelis

1995

J. Polym. Sci. A Polym. Chem.

1,262

775

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A new polymer-ceramic nanocomposite has been synthesized consisting of well-dispersed, two-dimensional layers of an organically modified mica-type silicate (MTS) within a degradable poly(c-caprolactone) matrix. A protonated amino acid derivative of MTS was used to promote delamination/dispersion of the host layers and initiate ring-opening polymerization of c-caprolactone monomer, resulting in poly(e-caprolactone) chains that are ionically bound to the silicate layers. The polymer chains can be released from the silicate surface by a reverse ion-exchange reaction and were shown to be spectroscopically similar to pure poly(e-caprolactone). Thick films of the polymer nanocomposite exhibit a significant reduction in water vapor permeability that shows a linear dependence on silicate content. The permeability of nanocomposite containing as low as 4.8% silicate by volume was reduced by nearly a n order of magnitude compared to pure poly(c-caprolactone). 0 1995 John Wiley & Sons, Inc.

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Section: C1-h3n+rc02[c(=o)(ch2)60]n+1h + Li+ -Mts (4)mentioning

confidence: 99%

Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites

Messersmith

Giannelis

1995

J. Polym. Sci. A Polym. Chem.

1,262

775

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“…Polymer-clay nanocomposites have been studied extensively for several years, and it is now known that the fire properties, thermal stability [1] and [2], gas barrier properties [3], ionic conductivity [4], mechanical properties [5] and [6], etc., are all improved relative to the virgin polymer. Nanocomposites can be described as immiscible, intercalated or exfoliated depending on the type of dispersion of the nanomaterial in the polymer.…”

Section: Introductionmentioning

confidence: 99%

Ferrocene and ferrocenium modified clays and their styrene and EVA composites

Manzi-Nshuti

Wilkie

2007

Polymer Degradation and Stability

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Abstract:In this work, ferrocene-and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.

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“…[1] These materials have shown enhanced mechanical properties, such as increased stiffness and strength, [2] thermal stability and flame retardancy [3] and gas barrier properties [4] relative to the pure polymers. There are two distinct nanostructures identified in these nanocomposites: intercalated and exfoliated/delaminated.…”

Section: Introductionmentioning

confidence: 99%

Versatile method for synthesis of electrically conductive polypyrrole-polystyrene clay nanocomposites using ATRP and chemical polymerisation methods

Abbasian

Massomi

Rashidzadeh

et al. 2014

Journal of Experimental Nanoscience

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A synthetic route for the preparation of a novel solution copolymer derived from styrene (St), pyrrole (Py) and its organoclay nanocomposite with conductive and mechanical properties is demonstrated. The electroactive copolymer of polystyrene-g-polypyrrole (PSt-g-Ppy) nanocomposite was successfully prepared by atom transfer radical polymerisation (ATRP) and chemical polymerisation methods. First, potassium pyrrole was reacted by a-chlorophenyl acetyl chloride to prepare an initiator that can polymerise styrene by ATRP technique. Then, polypyrrole was prepared by chemical polymerisation using FeCl 3 as an oxidant in dichloromethane , s solvent. Nanocomposites of the copolymer with modified montmorillonite were prepared with a solution intercalation method. The conductivity of the copolymer was measured by the four-point probe method. The structures of the intermediate, copolymer and nanocomposite were investigated by Fourier transform infrared spectroscopy, 1 H-NMR and X-ray diffraction techniques. The molecular weight of the copolymer was determined by gel permeation chromatography. Their thermal behaviour was examined by differential scanning calorimetry and thermogravimetric analyses.

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On the Nature of Polyimide-Clay Hybrid Composites

Cited by 547 publications

References 0 publications

Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites

Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites

Ferrocene and ferrocenium modified clays and their styrene and EVA composites

Versatile method for synthesis of electrically conductive polypyrrole-polystyrene clay nanocomposites using ATRP and chemical polymerisation methods

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