Article Defining the Degree of Degradation in Plastics: Quantification of Accumulated Degradation Products and Leached Stabilizers for Predicting End-of-Life

Yusuke Hibi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Tsukasa Matsumoto ; Masatoshi Midorikawa ; Shiho Uesaka ; Makoto Mizoshiri ; Toshiyuki Tanimura ; Masato Okada ; Kimiyoshi Naito SAMURAI ORCID (National Institute for Materials ScienceROR) ; Masanobu Naito SAMURAI ORCID (National Institute for Materials ScienceROR)

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Yusuke Hibi, Tsukasa Matsumoto, Masatoshi Midorikawa, Shiho Uesaka, Makoto Mizoshiri, Toshiyuki Tanimura, Masato Okada, Kimiyoshi Naito, Masanobu Naito. Defining the Degree of Degradation in Plastics: Quantification of Accumulated Degradation Products and Leached Stabilizers for Predicting End-of-Life. Polymer Degradation and Stability. 2024, 232 (), 111128.
SAMURAI

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(abstract)

Plastics degrade through various mechanisms, complicating the comprehensive chemical definition of degradation. As the accumulation of degraded products leads to sudden declines in material properties and triggers microplastic dispersion, a chemical degradation metric is essential for predicting plastics’ end-of-life. Here, we propose defining degradation by the weight ratio of “completely degraded polymer (CDP)” to pristine polymer, determined via pyrolysis mass spectrometry (MS). By simplifying the complex degradation evaluation into a straightforward framework of compositional analysis, a comprehensive degradation metric can be obtained without tracking individual degradation pathways. Moreover, by including stabilizers as system components, stabilizer leaching and polymer degradation can be concurrently visualized in the same framework. We demonstrate this approach in polyurethane films subjected to accelerated degradation tests and, by correlating the CDP-defined degradation metric with mechanical property evaluations, successfully identify the threshold degradation level that marks a material’s end-of-life. Furthermore, this method reveals deeper insights into degradation mechanisms: stabilizer leaching and polymer degradation are complementary processes that induce each other. This comprehensive degradation metric will also be crucial for grading recycled materials, promoting the circular economy in plastics.

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Keyword: Degradation metrics, Beyond carbonyl index , Microplastics, Additive leaching, Pyrolysis mass spectrometry, Reference-free quantitative mass spectrometry

Date published: 2024-12-06

Publisher: Elsevier BV

Journal:

  • Polymer Degradation and Stability (ISSN: 01413910) vol. 232 111128

Funding:

  • Government of Japan Ministry of Education Culture Sports Science and Technology JPMXP1122714694
  • Japan Society for the Promotion of Science JP24K08520
  • Core Research for Evolutional Science and Technology JPMJCR19J3

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.polymdegradstab.2024.111128

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Updated at: 2024-12-14 12:30:42 +0900

Published on MDR: 2024-12-15 08:30:33 +0900

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