Gradiently Anisotropic Conducting and Magnetic Polymer Composites

Aneli, Jimsher; Nadareishvili, L. I.; Мамниашвили, Г. И.; Akhalkatsi, Anatoli; Заиков, Г. Е.

doi:10.23939/chcht06.03.285

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…As it was shown above in polymer composites containing conductive particles, an increase in the drawing degree leads to a gradual increase in the electrical resistance of composite, which is caused by a gradual reduction of volume concentration of conductive particles in the drawing direction. A similar reasoning is also valid for composites containing a magnetic filler [37][38][39][40].…”

Section: Zonal Graded Stretching Methods and Functionally Graded Matermentioning

confidence: 71%

“…The intensity of redistribution of concentration is proportional to the value of relative elongation in a given region of the sample. The features of distribution of concentration of functional filler in local areas directly affect the properties of these areas [37][38][39][40].…”

Section: Zonal Graded Stretching Methods and Functionally Graded Matermentioning

confidence: 99%

“…By the example of gradient-oriented films of polyvinyl alcohol and polyethylene terephthalate, a good correlation is established between the values of relative elongation and birefringence [22][23][24][25][26][27]36]. Investigations of electric and magnetic properties of gradually stretched polymer composite films (polyvinyl alcohol with graphite, carbon black, and nickel) show that the character of change of these properties essentially depends both on the composition of materials and their degree of elongation [37][38][39][40].…”

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confidence: 99%

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Method and Mathematical Modeling of Formation of Gradually and Homogeneously Oriented Linear Polymers

Nadareishvili

Bakuradze

Aneli³

et al. 2019

International Journal of Polymer Science

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Previously, we developed several technical solutions for the conversion of isotropic polymers into materials of a new type—gradually oriented polymers with a gradient of physical and mechanical properties, thereby materializing for the first time the unused possibilities inherent in the polymeric nature of the substance. The scientific basis of these developments is the concept of a new structural state of linear polymers—a gradually oriented (stretched) state (GOS), the essence of which is set out briefly. An algorithm and a mathematical model for controlling the process of uniaxial, zonal stretching of linear polymers are proposed, which allow the formation of gradually or homogeneously oriented polymers (polymer composites). At the same time, specified values of quantitative parameters are ensured, in particular, the selected profile of distribution of the relative elongation (linear, sinusoidal, etc.) along the length of the gradually oriented polymer sample and the specified constant relative elongation along the length of the homogeneously oriented polymer. Mathematical expressions for calculating the conditions to obtain gradually oriented polymers with given geometric dimensions (length, width) and with a given distribution of relative elongation along the length of the resulting sample were also derived. The description of method and principles of operation of the appropriate device is given. Experimental data illustrating the possibilities of the proposed method and the efficiency of mathematical modeling are presented. The issues of creating functionally graded materials with a gradient of microstructure (gradient of degree of orientation/relative elongation) or chemical composition (volume fraction of functional fillers), respectively, based on thermoplastic polymer/copolymer or polymer composite (containing functional fillers) by method of uniaxial, zonal graded stretching are discussed.

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Section: Zonal Graded Stretching Methods and Functionally Graded Matermentioning

confidence: 71%

Section: Zonal Graded Stretching Methods and Functionally Graded Matermentioning

confidence: 99%

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confidence: 99%

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Method and Mathematical Modeling of Formation of Gradually and Homogeneously Oriented Linear Polymers

Nadareishvili

Bakuradze

Aneli³

et al. 2019

International Journal of Polymer Science

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“…Resulting self-assembly of C/Co nanopowders caused changes in their concentration and modulation of local resistance along the radius of the sample, which was measured by a two-contact method as in our previous work [6] (Figs. 2-7).…”

Section: Resultsmentioning

confidence: 99%

Self-Assembly Processes of the Magnetic Polymer Nanocomposites in Magnetic Fields

Aneli¹,

Gavasheli²,

Gegechkori³

et al. 2019

ChChT

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“…The value of coercivity of pure NiNPs increased from 154.13 to 185.5 G, measured in the Ni-PS composite films, while the value of room temperature exchange bias (H EB ) decreases with increasing Ni content from 56.5 to 21.1 G. These results suggested strong coupling between the ferromagnetic phase and the disordered surface spins in the PS matrix. Magnetic susceptibility of thin films made of NiNPs with polyvinyl alcohol and graphite was experimentally studied by Aneli et al 51 Gradient distribution of NiNPs in the stretched direction resulted in equivalent change of magnetic properties. It was concluded that structural anisotropy was the main reason of anisotropy in magnetic properties of the composites.…”

Section: Magnetic Properties Of Ni Nanoparticlesmentioning

confidence: 99%

Optimization of Epoxidation Palm-Based Oleic Acid to Produce Polyols

Jalil¹,

Rasnan²,

Yamin³

et al. 2022

ChChT

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Optimization of epoxidation by using response surface methodology (RSM) based on three-level three-factorial central composite design (CCD) was used. Response percentage of relative oxirane content (%RCO) was studied to determine the optimum reaction condition for production of polyols. The predicted value of model (85 %) was excellent in accordance to experimental value (81 %). All parameters (temperature, molar ratio of formic acid to oleic acid and molar ratio of hydrogen peroxide to oleic acid) were significant in influencing the course of epoxidation reaction (p < 0.05). The interaction between all parameters is also highly significant with p < 0.0001. Optimum reaction conditions obtained from RSM were as follows: the temperature 318 K, molar ratio of formic acid to oleic acid 1.64:1 and molar ratio of hydrogen peroxide to oleic acid 2:1. The epoxidation of palm oleic acid was carried out by using in situ performic acid. FTIR analysis showed the formation of epoxy functional groups at optimum reaction condition at the wavelength of 1340 cm-1. This epoxide group was used to produce polyols by using hydroxylation process and the polyols functional group was detected at the wavelength of 816 cm-1

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Gradiently Anisotropic Conducting and Magnetic Polymer Composites

Cited by 7 publications

References 5 publications

Method and Mathematical Modeling of Formation of Gradually and Homogeneously Oriented Linear Polymers

Method and Mathematical Modeling of Formation of Gradually and Homogeneously Oriented Linear Polymers

Self-Assembly Processes of the Magnetic Polymer Nanocomposites in Magnetic Fields

Optimization of Epoxidation Palm-Based Oleic Acid to Produce Polyols

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