Evaluation of UV‐induced embrittlement of PE‐HD by Charpy impact test
| Autor: | Martin Böhning, Maren Erdmann, Ute Niebergall, Volker Wachtendorf |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics Charpy impact test Izod impact strength test Fracture mechanics 02 engineering and technology General Chemistry Polyethylene 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Differential scanning calorimetry Brittleness chemistry Materials Chemistry Fracture (geology) Composite material 0210 nano-technology Embrittlement |
| Zdroj: | Journal of Applied Polymer Science. 137:49069 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.49069 |
| Popis: | The impact fracture behavior of two common high-density polyethylene grades for container applications were intensively studied by the instrumented Charpy impact test after well-defined exposure to UV-irradiation. Individual stages of the impact event, such as crack initiation and crack propagation energy as well as maximum impact load, were investigated from the recorded load–deflection curves. UV-induced material property changes were further investigated by infrared spectroscopy, differential scanning calorimetry, and dynamic-mechanical analysis as well as density measurements. Based on the results of the Charpy impact test, three indicators were identified to describe the extend of photooxidation on high-density polyethylene: (a) a reduced Charpy impact strength—at least to half of its initial value for a distinctly brittle impact fracture, (b) a marked decrease in the crack propagation contribution to the impact strength, and (c) an increase of the brittle features of the fracture surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text