Depth profiling by AFM nanoindentations and micro-FTIR spectroscopy for the study of polymer ageing

摘要

A method of depth profiling by AFM nano-indentations is developed for the characterisation of the heterogeneity of the mechanical properties of oxidised polymers. An increase or a decrease of the sample stiffness is measured close to the surface. A comparison with micro-FTIR profiles and a knowledge of the photooxidation mechanism permit an interpretation of the chemical and physical changes and give new insights into the understanding of the ageing behaviour.