A Hypothesis of Interaction of Composites Filler Particles with Polymeric Matrix
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BB3.9.1
А Hypothesis of Interaction of Composites Filler Particles with Polymeric Matrix Makaryan V.K. Scientific Production Enterprise “Mane”
ABSTRACT In order to determine the adhesion of filler particles to polymeric matrix a set of tests on the tensile strength of composite materials based on CFD and PPS has been performed. The best results were observed for composites with nanosized amorphous fillers Mo and MoO2. The strength of composites filled with such fillers increased up to 2 times compared to the pure polymer value. The effect of using fine-ground mineral fillers is less – about 1.5 times. Coarse fractions of mineral fillers (50µm) do not have positive effect on the composite tensile strength. Thus, the effect of fillers on the mechanical properties of polymer-based composites depends heavily on the nature and dispersivity of the filler and is apparently determined by the behavior of chemical and mechanical bonds occurring on the phase boundaries. The large number of bonds for nanosized fillers is promoted by the high specific (to surface area) number of radicals on their surface, which results in strong bounding of particle to matrix, besides the polymeric material close to the phase boundary gains additional properties. Since the size of nanoparticles is proportional to the thickness of interphase boundary layer, the considerable portion of the composite material transforms to a boundary interphase state, which properties, being different from both filler and polymer properties, determine the new characteristics of the composite material. INTRODUCTION The polymer-based composite materials are micro-heterogeneous systems, composed of two or more phases. Generally one of the phases is continuous (the polymeric matrix) and comprises the particles of other phases. The physical-mechanical and tribological properties of such materials are mainly determined by the behavior of mechanical and chemical bonds, formed on the phase boundaries [1]. The formation of a large number of bonds contributes to the firm fixing of the filler particle inside the matrix. At the same time some volume of the polymeric matrix, surrounding the particle, gains additional properties, becoming different from the initial material. If the bonds are not strong enough, the particle may shift and break the initial bonds being exposed to external loading. In such case the filler particle will behave as a completely foreign substance and will deteriorate the properties of the polymeric matrix. Thus the evaluation of the surface bonds has considerable interest, particularly the condition, at which the filler particle and the matrix may be considered as a single whole.
BB3.9.2
EXPERIMENTAL A set of composite materials based on the polyphenylene sulfide (PPS) and copolymer of formaldehyde and dioxolane (CFD) were chosen as research objects. The following fillers were used: crystalline molybdenum with particle sizes of 100-200 nm and 50 um, and amorphous molybdenum with 5-10 nm particle size, obtained using quantum-chemical technology of n
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