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Oral Sessions
Day 2, June 23（Mon.） 12:40-12:55
Room A (Maesato West)
- 2A-O1-1240
Multifaceted degradation evaluation of PET bottles subjected to outdoor exposure test
(1JEOL, 2The Council for PET Bottle Recycling)
oTakaya Satoh1, Azusa Kubota1, Chikako Nakayama1, Yusuke Sakuda1, Kouji Takahashi2, Masahiko Asano2
There are concerns that polymeric materials degrade due to the effects of light, oxygen, heat, etc., which contribute to environmental impacts such as the production of microplastics. In addition, when considering the recycling of plastic materials, it will be essential to evaluate changes in chemical structure due to environmental factors. However, there is a theoretical limit to the information that can be obtained with a single analytical method, so it is essential to perform multifaceted verification by combining analytical methods. It becomes possible to cross-check the information obtained from different analytical methods. In this presentation, we evaluated the degradation of PET bottles subjected to outdoor exposure tests using the following methods, mainly using pyrolysis gas chromatography-mass spectrometry (Py GC-MS) and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOFMS) to evaluate chemical structural changes. Py GC-MS can mainly confirm the changes in the main chain structure of PET, while MALDI-TOFMS can investigate changes in the end group structure. We also compared the results using scanning electron microscopy(SEM) and transmission electron microscopy (TEM) to observe the morphological changes on the sample surface.