Thermal oxidative ageing of neopentylpolyol ester oils: Evaluation of thermal‐oxidative stability by quantitative determination of volatile ageing products

Abstract

Abstract During thermal‐oxidative ageing of pentaerythritol ester‐based oils a variety of volatile degradation products, eg acids, aldehydes, ketones, esters and O‐heterocyclic compounds are produced. It is shown that quantitative determination of individual acids and carbonyls using GC‐MS and/or HPLC can be used to assess the ageing behaviour of fully formulated aviation turbine oils. Of special importance is the Tenax‐GC method which allows a simultaneous determination of all volatile degradation products by GC‐MS. This is the third of a series of papers on thermal‐oxidative ageing of neopentylpolyol ester oils. 1,3