Abstract
Backgrounds. The regularities of the structure formation of polymer microcomposite materials during their cooling from the melt are established. Objective. The aim of the work is to study the crystallization features of microcomposites based on a polypropylene matrix with a filler in the form of aluminum microparticles.Methods. The research technique includes two stages: the experimental receipt of crystallization exotherms and, based on them, the theoretical determination of the main characteristics of the structure formation process.Results. The patterns of composites crystallization were studied in a wide range of changes in the melt cooling rate and the mass fraction of filler for microcomposites obtained by two methods, the first of which is based on mixing the components in dry form, the second – in the polymer melt. An analysis of the structure formation mechanisms of the studied composites at the nucleation stage and at the stage of structures formation in the melt volume is made.Conclusions. It is shown that at the first of the indicated stages, a planar and volumetric crystallization mechanism is realized with some prevalence of the volumetric one. At the second stage, when using the method of producing composites, based on the mixing of components in a dry form, a tense matrix mechanism takes place; when implementing the method of mixing components in a polymer melt, the structure formation mechanism depends on the mass fraction of the filler.
Highlights
Among the synthetic materials, which significantly displaced traditional natural materials in modern production, polymer microcomposites occupy a special place
The development of polymer composite materials with the necessary combination of properties is based on comprehensive research, including the selection of the polymer matrix material, the type and mass fraction of the filler, the study of the structural formation of the composites depending on the method of their producing, its technological parameters, etc
The aim of this work is to establish the patterns of structure formation of polymer microcomposites with a polypropylene matrix filled with aluminum microparticles
Summary
Among the synthetic materials, which significantly displaced traditional natural materials in modern production, polymer microcomposites occupy a special place. This is largely due to the wide variety of their properties, the possibility of production new composites due to the special choice of their components – both the type of polymer matrix, and the material and concentration of the filler. In this case, it is possible to create composites with the required set of pro-perties (strength, deformation, heat-conducting, etc.), oriented to the specific conditions of their operation[1 – 12]. The development of polymer composite materials with the necessary combination of properties is based on comprehensive research, including the selection of the polymer matrix material, the type and mass fraction of the filler, the study of the structural formation of the composites depending on the method of their producing, its technological parameters, etc.
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