Determination of volatile components of modified polysulfide rubber through headspace-gas chromatography-mass spectrometry

The volatile components in modified polysulfide rubber were analyzed by headspace-gas chromatography-mass spectrometry. The sample amount,injection volume, inlet temperature of gas chromatography(GC) conditions were optimized using the orthogonal test method, and the equilibrium temperature and equilibrium time of the headspace(HS) sampling were optimized. The results showed that under such GC conditions as sample amount of 0.1 g,injection volume of 1.0 mL, the inlet temperature of 250℃, using such HS conditions as equilibrium temperature of 90℃, equilibrium time of 20 min,and combination of NIST MS Library search and literature retrieva, 4 kinds of volatile compounds, which recognized as the thiirane, mercaptoethanol, two butyl ether and dibutyl phthalate were idetified. Using ethylene glycol as the internal standard, the 4 kinds of main volatile components relative content of the modified polysulfide rubber products from 6 different production conditions were located in 0~3.633 1 mg/g with the relative standard error(RSD) was 2.52%~6.56%. This method had good repeatability.