CHEMILUMINESCENCE AND FLUORESCENCE IMAGING OF VIRGIN AND REPROCESSED GRADES OF NYLON 6,6 AND POLYCARBONATE

摘要

Chemiluminescence and Fluorescence Imaging can be used as novel quality control techniques applied to reprocessed resins. Chemiluminescence measurements of Nylon 6,6 in both air and nitrogen atmosphere reveal increased sample oxidation with increased number of molding cycle. Fluorescence imaging of reprocessed polycarbonate pellets compared to virgin shows significantly greater intensity from reprocessed resins. GPC and Raman Spectroscopy confirm disorder in reprocessed resins. Both Chemiluminescence and Fluorescence imaging techniques performed in combination yield information related to sample morphology and contamination. By careful selection of excitation and emission filters, Fluorescence imaging can discern regrind amounts in plastics to better than 5% resolution.