The environmentally friendly binder - poly[(trimethoxy)4-vinylphenethyl)] silane was synthesized for the first time via Friedel-Crafts alkylation reaction, which was conducted by the reaction of polystyrene with vinyltrimethoxysilane in the presence of anhydrous AlCl3.The synthesized polymer was identified using 1H, 13C, 1H COSY NMR, and FTIR spectroscopy.
This research aimed to study the effects of adding hydrophilic silica nanoparticles as nanofiller on tread properties of a typical tyre compound. In this respect, four compounds were prepared as a representative of the tread of the tyre. The amount of 0, 1, 3, and 5 phr (parts of filler per hundred parts of rubber) of nanofiller were added by melt mixing method. Physical and mechanical properties of compounds were measured. The structure and morphology of the fractured surface of the compounds were characterized using field emission scanning electron microscopy (Fe-SEM).
Alumina-based composites reinforced with titanium were manufactured by powder techniques. Characterizations indicate that titanium content affects densification which in turn causes positive effects on hardness and toughness. Microstructure presents grains of irregular shape and small sizes. Electrochemical impedance spectroscopy indicates that additions of titanium on Al2O3 enhance its corrosion resistance.
Cumulative experience in the field of development of bioactive glass ceramics for bone implants and methods of strengthening thereof have been analyzed. Compositions were selected and model glasses were synthesized, the relationship between viscosity and crystallization ability of glass ceramics has been studied. Composite materials based on the glass ceramics and zirconia have been synthesized, their mechanical properties studied, and feasibility of their use in the creation of bone implants has been established.
A new approach in the field of sustainable building materials is based on the use of renewable raw materials instead of non-renewable ones. A great potential for the use of fast renewable raw material has a group of plants that are the source of fibers and non-fibrous components. The use of plant fibers and/or particles as fillers into building material with reinforcement function of composite is motivated by the need to develop environmentally friendly products in accordance with principles of sustainable development in the building industry.
Розроблено новий спосіб одержання високоякісних плівок на основі полівінілового
спирту та модифікованого монтморилоніту. Досліджено механічну міцність, водо-
поглинання та бензотривкість плівок на основі різних марок полівінілового спирту
залежно від вмісту модифікатора та режимів одержання. Встановлено, що введення
монтморилоніт-полівінілпіролідонової суміші до полівінілового спирту суттєво впливає
на експлуатаційні властивості плівок на його основі, зокрема дещо знижується
The perspective of glass-ceramic high-strength materials used for personal armor elements has been established. The methodological approach has been developed and the choice of initial lithium aluminosilicate system for obtaining high-strength lightweight glass-ceramic materials has been substantiated. The glass formation area in the chosen system was studied, and model glasses were synthesized. Features of crystal structure formation during heat treatment of the developed model glasses were investigated. As a result, high-strength glass-ceramic materials have been developed.
A series of polymer alloys based on different compositions of Nylon 6,6 oligomers (NYL66Oґs) and epoxy resin have been prepared. The oligomer was extracted from the waste residues of the industrial production of nylon 6,6 and was dissolved in the epoxy resin. The mixture was crosslinked at 333 K using dodecenylsuccinic anhydre (DDSA) as a curing agent. The tensile strength and flexural modulus were found to increase with the addition of NYLO66O up to a maximum value of 2 wt % oligomer content.
Hessian cloth (jute fabrics) samples were soaked in the alcoholic shellac solution and dried at 333 K for 4 hours. Six layers of shellac treated hessian cloth were heat pressed (373 K for 10 min at 5 MT pressure) to fabricate biocomposite and then its mechanical properties were evaluated. To improve the mechanical properties of the biocomposite, a series of formulations was prepared using varying percentages of urea (0.25 to 30 %) with shellac in methanol; then the composite was fabricated using same parameters.
The methods of nanostructures adjustment in cross-linked epoxy polymers were considered. The large potential of changing mechanical properties of these materials by nanoclusters relative fraction variation was shown.