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• W1987367065 abstract "The melt-extrusion transesterification of ethylene/vinylacetate (EVA) copolymer to ethylene/vinylalcohol (EVAL) copolymers has been monitored by on-line near infrared (NIR) spectroscopy. A total of 60 NIR spectra were measured within 37 minutes after the initial addition of octanol (reagent) and catalyst (sodium methoxide) at the exit of the extruder by use of a fibre-optic probe. The most significant intensity change is observed for a band at 7089 cm −1 due to the first overtone of an OH stretching mode of the EVAL copolymers. We can monitor the progress of the reaction by plotting the peak intensity at 7089 cm −1 only. A principal component analysis (PCA) was carried out for the series of NIR spectra in the 7300–6900 cm −1 region. A score plot of PCA factor 1 is almost identical with the plot of the peak intensity at 7089 cm −1 . Calibration models for predicting the vinyl acetate content in EVA copolymers have been developed by use of partial least squares (PLS) regression. The correlation coefficient and standard error of prediction are 0.96 and 0.85%, respectively, indicating that the described technique can be used to monitor the transesterification reaction." @default.
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• W1987367065 date "2002-06-01" @default.
• W1987367065 modified "2023-10-03" @default.
• W1987367065 title "On-Line Monitoring of Melt-Extrusion Transesterification of Ethylene Vinylacetate Copolymers by near Infrared Spectroscopy and Chemometrics" @default.
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• W1987367065 doi "https://doi.org/10.1255/jnirs.335" @default.
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