The Measurement of Density and Melt Index in Low Density Polyethylene Using AOTF-NIR Spectroscopy

A Brimrose Free Space spectrometer with a rotating cup accessory was used to collect spectral data on samples of low density polyethylene with known values of melt index and density. The regression models showed excellent correlation between the spectral data and the reference values. The regression coefficients confirmed that the model took the relevant information from wavelength ranges where polymers absorb.

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