Abstract
We established in the present work the regularities for obtaining homogeneous nanocomposites based on the mixture of PP/PA-6 with montmorillonite modified using PVP. In these nanocomposites, PA-6 and MMT contribute to the increase in thermal resistance of the material, while PVP improves compatibility between polar PA-6 and hydrophobic PP. The goal of the present work was to investigate by applying the methods of thermogravimetric analysis a correlation between thermal characteristics of the newly-created nanocomposites based on the mixture of PE/PA-6 with montmorillonite, modified using PVP, and to determine the optimal composition of a nanocomposite with enhanced thermal resistance and a wide temperature interval of the viscous-fluid state. On the basis of experimental data, it was found that the mixtures of polypropylene with polyamide modified by the montmorillonite-polyvinylpyrrolidone mixture are distinguished by the higher thermal resistance compared with the starting PP. It is established that at a content of the modified polyamide in the mixtures with polypropylene within 30 % by weight, samples of the composite are characterized by the highest thermal resistance ‒ weight loss of such composites in a temperature range of 218‒322 oC is only 7.1 %, temperature of the onset of thermo-oxidation destruction is 300 oC. It is shown that the developed nanocomposites have wider temperature intervals of the viscous-fluid state – 126–300 oC. This makes it possible, by changing the modes of processing, to influence the structure and properties of products, especially taking into account the difference in crystallization of the material depending on the conditions and the method of processing. It is established that the most suitable for application and processing is the mixture of polypropylene with modified polyamide in the ratio 70:30 % by weight, respectively
Highlights
Creation of polymeric nanocomposites based on the polymers of structural designation is a relevant task at present
We worked out a three-stage technique for obtaining homogeneous nanocomposites based on the mixture PP/ PA-6 with montmorillonite modified by PVP, which rules out the use of complex compatibilizers
PA-6 and MMT contribute to an increase in the thermal resistance of a material, while PVP improves compatibility of the polar PA-6 with hydrophobic PP
Summary
Creation of polymeric nanocomposites based on the polymers of structural designation is a relevant task at present. At the end of 80s of the twentieth century, researchers from the concern Toyota obtained the first nanocomposite based on polyamide-6 and organomodified montmorillonite [4]. This composite was distinguished by increased physical- mechanical and thermal properties. The introduction of approximately 40‒50 % by weight of clays (bentonite, hector, etc.) did not lead to the improvement of properties of the polymeric material, first of all, because of the unsatisfactory dispersing of a silicate filler [7]. Significant progress in the creation of polymeric-silicate nanocomposites with improved physical and mechanical properties in comparison with the starting polymer and traditional dispersely-filled composites was achieved only in the 90s [8]
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