Kautschuk Gummi Kunststoffe, Vol.52, No.2, 124-133, 1999
A critical comparison of GC and HPLC in the analysis of rubber compounds
Methanolic extracts for chromatographic separation were obtained from a carbon black filled NBR vulcanizate. Possible errors in the preparation of the extracts are discussed. GC does not show a number of ingredients due to their low volatility and to thermal decomposition in the injection port or on the column. HPLC conceals substances with low uv-absorption. Substances early eluted in HPLC show peak broadening from strong extraction solvents; with dithiocarbamates, interaction with heavy metals from metallic parts of the equipment were noted, The influence of pH of the eluent is demonstrated; with its variation and with changes in the detection wavelength an optimization in HPLC separation power can be achieved.