LOW TEMPERATURE TECHNOLOGY FOR SYNTHESIS OF POLYAMIDE-6 AND ITS PROPERTIES

To obtain polymer composite materials, it is first necessary to focus on the physical and chemical properties of polymers, which are the basis for their production. One of the popular polymers for the production of products for industrial and everyday use in Russia and in the world is polyamide-6. The technology for producing this polymer by low-temperature hydrolytic polymerization of caprolactam is being developed and improved. Polyamide-6 prepolymer was obtained used a two-stage synthesis of caprolactam using water as a catalyst with a sequential decrease in temperature. To obtain a product with low viscosity, the resulting prepolymer is prepared for processing using a combined demonomerization and drying process in order to reduce the content of the monomer. To obtain a product with high viscosity and molecular weight, the processes of solid-phase polyamidation and combined demonomerization and drying were carried out sequentially. Optimal technological parameters were selected for each stage of the process. The main physicochemical parameters of the resulting product have been established: the content of caprolactam and low-molecular compounds, relative viscosity, molecular weight. The influence of the technological features of the developed technology on the final product properties is shown. The developed technological parameters make it possible, by incorporating the monomer and its oligomers into the polymer macromolecule, to increase the yield of the product, as well as the corresponding charac-teristics of the granulate. The final product has been proven to meet the requirements for polyamide-6, ready for processing into polymer composite materials. Low-viscosity polyamide-6 is used to produce threads and fibers, and high-viscosity polyamide is used to produce structural products and plastics. For citation: Barannikov M.V. Low temperature technology for synthesis of polyamide-6 and its properties. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 1. P. 72-76. DOI: 10.6060/ivkkt.20256801.7091.