期刊
POLYMER TESTING
卷 81, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2019.106194
关键词
Polyolefins; Oxidation; Polymer degradation; Nanoindentation
资金
- Fond Social Europeen (European Union)
- Region Guadeloupe (local state of France)
The aim of this study is to compare the mechanical properties of aged polymers measured at nano and macro scales in order to develop a fast characterization tools to predict polymer durability. Commercial thick PP/PE copolymer samples were aged under artificial aging conditions. The evolution of the mechanical properties with aging time was studied either at nano scale using a nanoindenter and at macro scale using a Dynamic Mechanical Analysis aparatus, nano and macro scale results were compared. Chemical degradation was monitored by infrared spectrometry and the surface topography was studied by Scanning Electron Microcopy. A Voigt model was used to calculate the Young's modulus of the bulk sample using the nano mechanical data and the results were compared to the measured macro Young's modulus. A good correlation was found between macro and nano scales as long as macroscopic defects such as cracks does not appeared. This work shows that nano indentation is a suitable technique to detect early stage degradation of polymers and therefore a powerful tool to predict durability of materials.
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