Simulation of the elastic-plastic behavior of polyolefin-based nanocomposites with a different structure of layered filler

Garishin, O. K.; Свистков, А. Л.; Gerasin, V. A.; Guseva, M. A.

doi:10.1134/s0965545x09040063

Cited by 4 publications

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“…Addition of them to the polymer, even small amounts of Silicate nanoplates (usually 3-5 wt.%), can significantly improve the barrier diffusing material properties, thermal stability, resistance to thermal warping [168][169][170][171][172]. This is due to the fact that in contrast to conventional composites (single components of conventional composites have micron and submicron sizes) to nanomaterials characterized extremely high interfacial area boundaries, resulting in their role in the formation of physical properties of the material becomes dominant.…”

Section: Nanomaterials Based On Layered Particlesmentioning

confidence: 99%

Section: Nanomaterials Based On Layered Particlesmentioning

confidence: 99%

“…Currently one of the most common types of nanocomposite is the systems based on polyolefins and layered clay minerals (smectite). In the past decade the world experienced a rapid growth in the number of publications and patents related to the manufacturing process and the study of their mechanical properties [171,175,177]. Such systems achieved a substantial increase in the elastic modulus, strength, fire resistance, resistance to thermal warpage improve barrier properties with respect to the diffusing substances.…”

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“…Thus, the structure collapses, and at the same time the silicate plates lose its orientation in space and are randomly distributed in the bulk material. Figure 24 is a schematic representation of the structure of the nanocomposite in cases intercalated and exfoliated filler [171].Mechanical properties of the nanocomposite improve if the silicate filler particles are oriented along the direction of the external deformation. This occurs due to improved adhesion between the matrix and the inclusions due to «biting» of the matrix and also when the outer plates are bent inwards and on the internal plates are absent bends.…”

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“…When the amount of the filler is only 6-8%, its elastic modulus increases approximately by 3 times. If we compare composites with granular filler, the famous Einstein's formula gives an increase in module only 1.2 times [180]. …”

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Nanocomposite organomineral hybrid materials. Part 3

Kudryavtsev¹,

Figovsky²

2016

Nanotehnol. stroit.

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PART III ExtEndEd AbstrAct:The paper addresses the issues of alkoxide method of sol-gel synthesis and non-hydrolytic method of sol-gel synthesis and colloidal method of sol-gel synthesis. The authors also consider an alternative approach based on the use of soluble silicates as precursors in the sol-gel technology, of nanocomposites. It was shown that nanocomposites can be produced through aerogels. The paper also analyzes the mixing technologies of nanocomposites preparation. It has been demonstrated the possibility to change the types of nano-phase which is used for obtaining nanocomposites in different approaches. Various models of packaging spherical, fibrous and layered nanoparticles, introduced into the structure of the nanocomposite, in the preparation thereof were examined.Key words: Nanocomposites, sol-gel synthesis, soluble silicates, metal alkoxide, sols, gels, aerogels, packing of spherical nanoparticles, packing of fibrous nanoparticles. THE RESULTS OF THE SPECIALISTS' AND SCIENTISTS' RESEARCHES MAchinE-rEAdAblE inforMAtion on cc-licEnsEs (htMl-codE) in MEtAdAtA of thE pApErThe first and the second parts of the paper are published in the issues 1/2016 and 2/2016. INFLUENCE OF VARIOUS FACTORS ON STRUCTURE AND PROPERTIES OF HYBRID MATERIALS Packing of spherical nanoparticles of the fillerThe system of pores in a solid is entirely determined by the nature of the packing of the primary particles. For example, when the hexagonal closest packing of spherical particles between disposed in a plane, the three nearest tetrahedral cavities is octahedral cavity. In subsequent accretions over the octahedral cavity occurs again octahedral cavity. Superimposed on top of each other octahedral cavities form channels that permeate the whole body of matter in the orthogonal directions [151]. In cubic structures of the closest packing may also indicate the formation of interconnected channels. In the package of this type the void volume is 25.95%. From here it is possible to calculate the bulk density of the material (ρ):, where: ρ k -crystallographic density of the material used as a basis. L -void fraction in the structure of the package. INTERNATIONAL EXPERIENCE 18http://nanobuild.ruIf the lightest of refractory materials has crystallographic density close to 3 g/cm 3 , the bulk density of the product with the densest packing is 2.2 g/cm 3 . From here, to obtain a materials with a bulk density less than 0.5 g/cm 3 , it is necessary to achieve a greater porosity of 83%.Let's try to analyze what kind of particle packing can achieve the desired porosity.Typically with decrease in the coordination of number of particles packed in the packaging structures of particles increases the pore volume. In the case of the densest packings, the coordination number of the package is 12. Consider the following options for the coordination numbers of the package. Classically, such a packing density was 74%, respectively; the porosity of such package is 26%. For monodisperse materials denser packaging does not happen.The coordination...

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Section: Nanomaterials Based On Layered Particlesmentioning

confidence: 99%

Section: Nanomaterials Based On Layered Particlesmentioning

confidence: 99%

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