IN-LINE FIBER-OPTIC NEAR-INFRARED SPECTROSCOPY: FEASIBILITY STUDIES FOR THE SIMULTANEOUS MONITORING OF VINYL ACETATE AND ERUCAMIDE ADDITIVE CONCENTRATIONS IN POLY(ETHYLENE VINYL ACETATE) COPOLYMERS

摘要

Feasibility studies for the simultaneous monitoring of vinyl acetate (VA) and erucamide additive concentrations in poly(ethylene vinyl acetate) (EVA) copolymers were undertaken using near-infrared (NIR) spectroscopy. Two groups of samples, each group containing different erucamide concentrations for a fixed VA concentration, were used. NIR spectra of flowing molten polymers were obtained in-line using a flow cell attached to an extruder. The first derivatives of the NIR spectra in the region 1900-2000 nm show overlapping peaks of VA and erucamide. These peaks were deconvoluted using multivariate analysis methods.