Impact of large aspect ratio, shear-stiff, mica-like clay on mechanical behaviour of PMMA/clay nanocomposites

Fischer, Bianca; Ziadeh, Mazen; Pfaff, André; Breu, Josef; Altstädt, Volker

doi:10.1016/j.polymer.2012.04.055

Cited by 31 publications

(22 citation statements)

References 25 publications

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“…In poly(methyl methacrylate) (PMMA)/clay nanocomposites, the tensile strength and fracture toughness improve significantly while elongation at break decreases slightly (24% at 4 wt% clay) with incorporation of novel clay in the PMMA matrix. This was reported to be due to aggregations of clay particles that act as stress amplifiers thereby reducing the aspect ratio of clay particles dispersed in the PMMA matrix …”

Section: Resultsmentioning

confidence: 99%

Synergistic effects of hybrid carbon nanomaterials in room‐temperature‐vulcanized silicone rubber

Kumar

Lee

2016

Polymer International

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This work examines nanocomposites based on nanofillers and room-temperature-vulcanized silicone rubber. The carbon nanofillers used were conductive carbon black (CB), carbon nanotubes (CNTs) and graphene (GE). Vulcanizates for CB, GE, CNTs as the only filler and hybrid fillers using CNTs, CB and GE were prepared by solution mixing. The elastic modulus for CNT hybrid with CB at 15 phr (4.65 MPa) was higher than for CB hybrid with GE (3.13 MPa) and CNTs/CB/GE as the only filler. Similarly, the resistance for CNT hybrid with CB at 10 phr (0.41 k ) was lower than for CB (0.84 k ) at 20 phr and CNTs as the only filler. These improvements result from efficient filler networking, a synergistic effect among the carbon nanomaterials, the high aspect ratio of CNTs and the improved filler dispersion in the rubber matrix.

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Section: Resultsmentioning

confidence: 99%

Synergistic effects of hybrid carbon nanomaterials in room‐temperature‐vulcanized silicone rubber

Kumar

Lee

2016

Polymer International

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“…In spite of the high stiffness of mica platelets (≈ 50 GPa) [27], the final reinforcing effect of mica was indeed moderate. The reason is that mica was added only to the coating biopolymer matrix (i.e., pullulan), while the ultimate elastic modulus value accounts for the final material, which includes the thin coating (less than 1 μm) and the thicker plastic substrate (≈ 12 μm).…”

Section: Tensile Propertiesmentioning

confidence: 96%

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Ünalan

Boyacı

Trabattoni

et al. 2017

Preprint

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This study presents a new bionanocomposite coating on poly(ethylene terephthalate) (PET) made of pullulan and synthetic mica. Mica nanolayers have a very high aspect ratio (α) at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mica (0.02 wt%, which is ϕ ≈ 0.00008) in pullulan coatings dramatically improved the oxygen barrier performance of the nanocomposite films under dry conditions, whereas this performance was partly lost as the environmental relative humidity (RH) increased. This outcome was explained in terms of the perturbation of the spatial ordering of mica sheets within the main pullulan phase because of RH fluctuations, as confirmed by modelling of the experimental OTR data according to Cussler's model. The presence of the synthetic nanobuilding block (NBB) led to a decrease in both static and kinetic coefficients of friction compared with neat PET (≈12% and 23%, respectively) and PET coated with unloaded pullulan (≈ 26% reduction in both coefficients). In spite of the presence of the filler, all of the coating formulations did not significantly impair the overall optical properties of the final material, which exhibited haze values below 3% and transmittance above 85%, with the only exception represented by the formulation with the highest loading of mica (1.5 wt%, which is ϕ ≈ 0.01). These findings revealed, for the first time, the potential of the NBB mica to produce nanocomposite coatings in combination with biopolymers for the generation of new functional features, such as transparent high oxygen barrier materials.

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“…It is well-known that not only the size but also the aspect ratio of fillers has a large effect on properties of composites as shown in the Halpin-Tsai model [24]. There are several reports conducted on the effect of aspect ratio of clays, graphene and carbon nanotube on properties of polymer composites [25][26][27][28][29][30][31][32][33]. For example, Weon et al [25] investigated the effect of aspect ratio and orientation of clay on properties of nylon-6 nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Effect of aspect ratio of graphene oxide on properties of poly (vinyl alcohol) nanocomposites

2019

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In this study, the effect of aspect ratio of graphene oxide (GO) on the properties of poly (vinyl alcohol) (PVA) nanocomposites were investigated. The PVA/GO nanocomposites were prepared by a simple solution casting method. GO with 3 different lateral sizes, 0.5, 1.5 and 3 mm were used. The higher the aspect ratio, the higher the Young's modulus obtained. The effect of aspect ratio on Young's modulus was in agreement with the Halpin-Tsai model, especially when GO was highly aligned in uniaxially drawn nanocomposites. Similar to the Young's modulus, the barrier properties increased with increasing GO aspect ratio. On the other hand, the highest glass transition temperature as well as the highest thermal decomposition temperature was achieved for the GO of the lowest aspect ratio. GRAPHICAL ABSTRACT ARTICLE HISTORY

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Impact of large aspect ratio, shear-stiff, mica-like clay on mechanical behaviour of PMMA/clay nanocomposites

Cited by 31 publications

References 25 publications

Synergistic effects of hybrid carbon nanomaterials in room‐temperature‐vulcanized silicone rubber

Synergistic effects of hybrid carbon nanomaterials in room‐temperature‐vulcanized silicone rubber

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Effect of aspect ratio of graphene oxide on properties of poly (vinyl alcohol) nanocomposites

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