Synthesis Of Polyacetylene And Stabilization Of Polyvinyl Chloride With Polyacetylene

The aim of the research was to investigate the comparative physicochemical properties of the synthesized cis-polyacetylene and the oxidized trans-derivative. During the process, the highest yield was achieved using a catalytic ratio of a Co(NO3)2:LiBH4 compound mixture at a ratio of 4:1 mol with a catalyst concentration of Vcatalizer=0.1%. The synthesis method employed T° solution =-5-0°C, with a slow introduction of pure HC≡CH over a period of t=1.5-2 hours. The reaction temperature was set at T°reaction = 55-40°C. The resulting product was filtered, and the unreacted acetylene and N-methylpyrrolidone were washed out using a solvent to eliminate the catalyst. Analysis of EPR spectra indicated a reduction in QPC from 4.7∙1017 spin/g to 3.15∙1016 spin/g. Utilizing a torsion balance, the kinetics of oxygen attachment to polyacetylene were examined at various temperatures (25, 75, 100, and 150 °C), revealing the highest oxygen content in polyacetylene by weight (up to 37%) within 15-18 hours. The polyacetylene, synthesized and incorporated into polyvinyl chloride, was used as a stabilizer. Addition of 1% polyacetylene to polyvinyl chloride augmented its thermal stability by 1.5 to 2 times. Its thermal stability was analyzed using thermogravimetric (TGA) and differential thermal analysis (DTA) within the range of 25-250°C through the Paulik devices. The main focus of this study was the synthesis of polyacetylene and the stabilization of polyvinyl chloride utilizing the obtained polyacetylene, while investigating the optimal conditions for this process. Employing Nmethylpyrrolidone as a highly selective solvent in polyacetylene synthesis resulted in a laboratory yield of up to 45.0%, while in an industrial setting at 0°C, it reached up to 38.0%.

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