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Biogenic Amorphous Silica as Filler for Elastomers

Journal of Renewable Materials 2018年第4期6卷 402-412页

作者： Nikolay Dishovsky petrunka malinova Ivan Uzunov University of Chemical Technology and Metallurgy-Sofia 8 St.Kliment Ohridski Blv.1756 SofiaBulgaria Institute of General and Inorganic Chemistry Bulgarian Academy of SciencesAcad.G.Bonchev Str.bl.111113 SofiaBulgaria

Natural products from agricultural wastes are finding importance in the polymer industry due to their many advantages such as being lightweight,low cost and environmentally *** the present study the potential of the two types of rice husk ash(RHA)prepared under different conditions as fillers in natural rubber-based elastomer composites was *** fillers were prepared by rice husks incineration and characterized by means of X-ray powder diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),scanning electron microscope(SEM),Brunauer-Emmett-Teller(BET)specific surface area,Hg-porosimetry and *** evaluation involved determining the vulcanization characteristics of the compounds and their physical and mechanical characteristics,resistance to thermal aging as well as the dynamic properties of the vulcanizates containing *** has been found that the ash from rice husk has good potential as filler in elastomers,especially as a substitute for synthetic commercially available *** improves the grip on ice and snow better than standard silica and may be used in formulations for shoe soles used for winter sports,extreme hiking footwear,ski boot soles,winter tire protectors,*** quality depends on the conditions under which rice husk is *** is recommended to run the process at a temperature not higher than 800°*** particular,cases in which the vulcanizates contain biogenic silica have very interesting characteristics like improved modulus at 300%of elongation,lower residual elongation,higher mechanical loss angle tangent at 0°C and lower at 60°C,and are superior to those of the vulcanizates containing commercially available filler Ultrasil?7000 GR.

关键词： Rice husk ash fillers natural rubber mechanical characteristics dynamic properties

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Natural Rubber Based Composites Comprising Different Types of Carbon-Silica Hybrid Fillers. Comparative Study on Their Electric, Dielectric and Microwave Properties, and Possible Applications

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Materials Sciences and Applications 2016年第6期7卷 295-306页

作者： Ahmed A. Al-Ghamdi Omar A. Al-Hartomy Falleh R. Al-Solamy Nikolay Dishovsky Mihail Mihaylov petrunka malinova Nikolay Atanasov Department of Physics Faculty of Science King Abdulaziz University Jeddah KSA Department of Mathematics Faculty of Science King Abdulaziz University Jeddah KSA Department of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Department of Telecommunications University of Telecommunications and Post Sofia Bulgaria Department of Communication and Computer Engineering South-West University "Neofit Rilski" of Blagoevgrad Blagoevgrad Bulgaria

The paper presents a comparative study on the electric, dielectric and microwave properties of natural rubber based composites comprising dual phase fillers prepared from furnace carbon black or conductive carbon black with a different amount of silica. It has been established that, the specifics of the carbon phase have a marked strong effect upon the properties mentioned above. The interpenetration of the two filler phases and the grade of isolation of the conductive carbon phase by the dielectric one depend on the ratio between them. On the other hand, that leads to a change in all properties of the studied composites, which allows tailoring those characteristics.

关键词： Polymer Composites Hybrid Fillers Dielectric Properties Microwave Properties

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A Comparative Study of the Phase Distribution in Carbon-Silica Hybrid Fillers for Rubber Obtained by Different Methods

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Materials Sciences and Applications 2014年第10期5卷 685-697页

作者： Omar A. Al-Hartomy Ahmed A. Al-Ghamdi Said A. Farha Al-Said Nikolay Dishovsky Michael B. Ward petrunka malinova Mihail Mihaylov Department of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Physics Faculty of Science University of Tabuk Tabuk Saudi Arabia Department of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria LEMAS Institute for Materials Research SPEME University of Leeds Leeds UK

Different types of carbon-silica fillers were prepared via pyrolysis-cum-water vapor of waste green tires tread and impregnation method. Dual phase fillers have been characterized by energy dispersive X-ray (EDX) spectroscopy in a scanning transmission electron microscope (STEM) or STEM-EDX. Phase distribution in hybrid fillers for rubber was investigated. The results achieved show that the conditions of obtaining influence the distribution and the location of the phases in the carbon-silica hybrid fillers as well as their most essential characteristics including specific area, oil absorption number, iodine adsorption number, ash content and others.

关键词： Carbon Silica Hybrid Fillers Pyrolisis Impregnation Filler Characterization STEM-EDX Method

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Correlation between Electrical Conductivity and Microwave Shielding Effectiveness of Natural Rubber Based Composites, Containing Different Hybrid Fillers Obtained by Impregnation Technology

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Materials Sciences and Applications 2016年第9期7卷 496-509页

作者： Ahmed A. Al-Ghamdi Omar A. Al-Hartomy Falleh R. Al-Solamy Nikolay T. Dishovsky petrunka malinova Nikolay T. Atanasov Gabriela L. Atanasova Department of Physics Faculty of Science King Abdulaziz University Jeddah KSA Department of Mathematics Faculty of Science King Abdulaziz University Jeddah KSA Department of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Department of Telecommunications Faculty of Telecommunications and Management University of Telecommunications and Post Sofia Bulgaria Department of Communication and Computer Engineering Faculty of Engineering South-West University ‘Neofit Rilski’ Blagoevgrad Bulgaria

The paper presents the synthesis and characterization of carbon black/silicone dioxide hybrid fillers obtained by an impregnation technology. The electromagnetic interference shielding effectiveness of the composites filled with carbon black/silicone dioxide hybrid fillers was measured in wide frequency range of 1 - 12 GHz. The dc and ac electrical conductivity of composites also have been investigated. The relationship between electrical (dc and ac) conductivity and shielding effectiveness was analyzed. A positive correlation was found between the absorptive shielding effectiveness and ac conductivity for composites comprising conductive carbon black/silica filler, when the filler loading is above the percolation threshold.

关键词： Composite Materials Correlation Electrical Conductivity Shielding Effectiveness

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