The Characterisation of Polymeric Methylene Diphenyl Diisocyanates using UHPSFC and FT-ICR APPI-MS

摘要

Vaporiser temperature is critical to identify different series using FT-ICR MS, isocyanates (+ 5 rings), ureas (+ 2 rings) and carbodiimides (+ 4 rings). Methanol must be eliminated from all regions of the UPC~2 (modifier, wash and injection solvents) to avoid production of urethanes. Baseline separation of isocyanates (2-5 rings) achieved using UHPSFC-MS although other components not detected. Peak area of each EICC reflects the ratio of individual components expected to be present.