An analytical method for determination of polyurethane content in modified polyoxymethylene (POM) by nuclear magnetic resonance (NMR) spectroscopy was established in this paper. Specifically, the samples were dissolved in the deuterated reagent, followed by being tested by 1H-NMR spectroscopy. Next, the characteristic peaks of POM and polyurethane were integrated, and the polyurethane content in modified POM was obtained by integral area ratio. This method, featuring the advantages of a high accuracy, simple and fast operations, and no nominal samples required, has a relative standard deviation of < 2%, and its correlation coefficient with actual results was 0.9993.
The primary components, ash contents, and fillers of a batch of plastic road speed bumps and thermal baffles for import were analyzed using multiple analytical methods (e.g., Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD)). Based on appearance characteristics and manufacturing process, the sample origin was analyzed. Such products are made using insulated polyvinyl chloride (PVC) wire and cable sheath as the raw material. Specifically, the sheath is extruded and thermoformed into plastic products in a melting furnace following cleaning and sorting. The varying dates of declaration of goods lead to different assessment opinions on solid waste. In this paper, a case study was presented, providing a reference for identification and supervision of solid wastes of recycled plastic products for import.
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