Investigation of various polymeric materials for set-point temperature calibration in pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS)

摘要

The precision and long-term stability of pyroly sis probe set-point temperature calibration of a commercially available coiled-filament pyrolyzer were assessed for a variety of polymers, including Kraton~R D1107, high-density polyethylene (HDPE), and low-density polyethylene (LDPE). While plots of peak area ratios for Kraton~R and HDPE versus pyrolysis set-point temperatures produced statistically significant linear curves at the 95% confidence level, poor precision was observed at each of the set-point temperatures. Plots of peak area ratios for LDPE, in particular for n-C_(16) alkyldiene-C_(16) alkene peak area ratios, also exhibited good linearity but showed significant improvements in precision at each set-point temperature. In addition, replicate analysis over a 10-month period of peak area ratios for polymers pyrolyzed at a set-point temperature of 900 ℃ confirmed the improved method precision obtained from pyrolysis of LDPE and analysis of the n-C_(16) alkyldiene-C_(16) alkene ratio when compared to the precision obtained from pyrolysis of Kraton~R Dl107 or high-density polyethylene.