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Impact of Enzymatic Degradation on the Material Properties of Poly(Ethylene Terephthalate)
Summary
This study tested whether a plastic-degrading enzyme (PETase) could break down recycled PET plastic and whether the degradation changed its material properties in ways that could affect fragmentation into microplastics. Enzyme treatment caused visible surface degradation and reduced the plastic's strength. Understanding how biological degradation alters plastic properties helps predict how PET breaks down into microplastics in the environment.
With macroscopic litter and its degradation into secondary microplastic as a major source of environmental pollution, one key challenge is understanding the pathways from macro- to microplastic by abiotic and biotic environmental impact. So far, little is known about the impact of biota on material properties. This study focuses on recycled, bottle-grade poly(ethylene terephthalate) (r-PET) and the degrading enzyme PETase from Ideonella sakaiensis. Compact tension (CT) specimens were incubated in an enzymatic solution and thermally and mechanically characterized. A time-dependent study up to 96 h revealed the formation of steadily growing colloidal structures. After 96 h incubation, high amounts of BHET dimer were found in a near-surface layer, affecting crack propagation and leading to faster material failure. The results of this pilot study show that enzymatic activity accelerates embrittlement and favors fragmentation. We conclude that PET-degrading enzymes must be viewed as a potentially relevant acceleration factor in macroplastic degradation.