Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Utracki, L. A.; Sepehr, Maryam; Boccaleri, Enrico

doi:10.1002/pat.852

Cited by 382 publications

(270 citation statements)

References 175 publications

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“…We emphasize that NTS even displays sheets in the range of more than tens of micrometres, thus being highly appealing for gas barrier materials, that crucially depend on having ultrahigh aspect ratio nanoplatelets. The imaging data of SUM and NHT reveal some differences with the literature values 56 . We find that SUM is larger and NHT is smaller in size than the reported value.…”

Section: Strategy and Building Blocks And Structural Characterizationmentioning

confidence: 41%

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

et al. 2015

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Nacre-mimetics hold great promise as mechanical high-performance and functional materials. Here we demonstrate large progress of mechanical and functional properties of self-assembled polymer/nanoclay nacre-mimetics by using synthetic nanoclays with aspect ratios covering three orders in magnitude (25-3,500). We establish comprehensive relationships among structure formation, nanostructuration, deformation mechanisms and mechanical properties as a function of nanoclay aspect ratio, and by tuning the viscoelastic properties of the soft phase via hydration. Highly ordered, large-scale nacre-mimetics are obtained even for low aspect ratio nanoplatelets and show pronounced inelastic deformation with very high toughness, while those formed by ultralarge nanoplatelets exhibit superb stiffness and strength, previously only reachable for highly crosslinked materials. Regarding functionalities, we report formerly impossible glass-like transparency, and excellent gas barrier considerably exceeding earlier nacre-mimetics based on natural nanoclay. Our study enables rational design of future high-performance nacre-mimetic materials and opens avenues for ecofriendly, transparent, self-standing and strong advanced barrier materials.

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Section: Strategy and Building Blocks And Structural Characterizationmentioning

confidence: 41%

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

et al. 2015

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“…Even though their preparation was described [1] in the 1960s, the field of polymer/layer silicate nanocomposites (PLSN) has only been actively pursued in the last decade or so, mostly because such materials can facilitate concurrent enhancements in mechanical, barrier, thermal and flammability properties [2], [3], [4], [5], [6] and [7]. However, in order to take full advantage of all these benefits, the surfactant and, subsequently, the nanocomposite, must "survive" the fabrication process or, in other words, the temperature or the extended residence time under shear must not lead to material degradation.…”

Section: Introductionmentioning

confidence: 99%

Benzimidazolium surfactants for modification of clays for use with styrenic polymers

Costache

Heidecker

Manias

et al. 2007

Polymer Degradation and Stability

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Abstract:Nanocomposites of polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS) and high impact polystyrene (HIPS) were prepared with two new homologous benzimidazolium surfactants used as organic modifications for the clays. The morphology of the polymer/clay hybrids was evaluated by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM), showing good overall dispersion of the clay. The thermal stability of the polymer/clay nanocomposites was enhanced, as evaluated by thermogravimetric analysis. From cone calorimetric measurements, the peak heat release rate of the nanocomposites was decreased by about the same amount as seen for other organically-modified, commercially available clays.

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“…, Ca ?2 or Mg ?2 cation originally present in the galleries with one organic cation such as alkylammonium ions via an ion-exchange reaction [8]. Besides this, MMT is naturally occurring, environment friendly, cheap, and readily available in large quantities [9]. Nowadays, the application of organo-modified montmorillonite (OMMT) as a nano-sized reinforcement in WPCs has been developed.…”

Section: Introductionmentioning

confidence: 99%

“…Smectic clays, particularly montmorillonite (MMT) minerals, serve as good nanoclay fillers owing to their ease of dispersability in the organic matrix. MMT is composed of aluminum silicate layers, which are organized in a parallel fashion to form stacks with a regular Van der Waals gap in between them called interlayer spacing or gallery [7][8][9]. Clays are in nature organophobic, but they can be chemically changed into organophilic by replacing the Na ?…”

Section: Introductionmentioning

confidence: 99%

Influence of Organically Modified Nanoclay on Thermal and Combustion Properties of Bagasse Reinforced HDPE Nanocomposites

2016

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The nanocomposites of high density polyethylene (HDPE)/bagasse flour (BF) with different contents of the organomodified montmorillonite (OMMT) were produced by melt blending process. The thermal stability and combustion behavior of nanocomposites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry, and cone calorimeter tests. The results of TGA data of the nanocomposites indicated that the OMMT greatly enhanced the thermal stability, and char residues of the HDPE/BF blends gradually increased with increasing the OMMT content. The activation energy was determined to describe the energy consumption of the initiation of the thermal degradation process. The composites produced with the 6 phc OMMT had the highest activation energy values among the evaluated composites (106 kJ/mol), whereas composites without nanoclay exhibited the lowest one. Furthermore, as the OMMT was incorporated into the nanocomposites, the melting temperature (T m ), crystallization temperature (T c ) melting enthalpy (DH m ) and crystallinity (X c ) of HDPE/BF blends increased. The findings showed that the OMMT effectively boosted the flame retardancy of nanocomposites due to the formation of the carbonaceous silicate char shields delayed time to ignition and the combustion process was remarkably hindered.

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Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Cited by 382 publications

References 175 publications

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

Benzimidazolium surfactants for modification of clays for use with styrenic polymers

Influence of Organically Modified Nanoclay on Thermal and Combustion Properties of Bagasse Reinforced HDPE Nanocomposites

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