Self degradation behavior of thermophilic temperature activated enzyme embedded PBAT in aerobic composting

Research background and core findings: According to the study published in Polymer Degradation and Stability Volume 254 (December 2026), authors Yaxin Xu, Lingling Fan, Hua Zhang, Fan L ü, Pin Jing He, Weiliang Dong, Min Jiang, Xiaoli Zhou, and Wei Peng investigated the biodegradation behavior of embedded enzyme PBAT under aerobic composting conditions. The research title clearly states that thermophilic temperature can activate the self biodegradation process of the material. This conclusion directly relates the temperature conditions to the degradation initiation mechanism of enzyme embedded polyester, providing new experimental clues for understanding the degradation rhythm of biodegradable plastics in actual composting environments.

Temperature conditions and degradation activation

The aerobic composting process usually goes through heating, high temperature (thermophilic), and cooling stages, with the thermophilic stage having higher temperatures and stronger microbial activity.

. The core conclusion of this study is that “thermophilic temperature activates self biodegradation”, indicating that enzymes embedded in PBAT matrix may not fully exert their function under normal temperature conditions, but are effectively activated during the thermophilic stage of composting, thereby promoting the hydrolysis and biodegradation of materials. For biodegradable polyester, this means that degradation is not solely dependent on the composition of the material itself, and the environmental temperature window is also a key variable determining whether degradation can be initiated in a timely manner.

Implications for the study of polymer aging and stabilization

From the perspective of polymer aging and stabilization technology, the degradation of degradable polyester in compost is essentially a controlled “aging fracture” process, whose rate is determined by temperature, moisture, microorganisms, and material structure.

. This study suggests that when evaluating the service life and environmental fate of biodegradable materials such as PBAT, enzyme embedding design and composting temperature curve need to be considered within the same framework. For formula designers, if the material needs to maintain performance during storage and use, but needs to degrade rapidly during disposal, the balance between antioxidant systems and degradation promotion mechanisms is particularly critical: conventional antioxidant systems are used to suppress thermal oxidative aging during processing and use, while enzyme embedding strategies serve directional degradation at the disposal end, complementing each other on a time scale. In addition, the outdoor and composting exposure scenarios involved in this study also evoke the boundary problem of weather resistant and stable design. For products that require long-term exposure to light and humid environments, light stable components such as HALS and UVA are often used to delay surface aging; In degradable systems, the type and amount of stable components can affect the timing of degradation initiation. How to achieve a balance between being durable and biodegradable when discarded through a complex system is a question that must be answered for the engineering application of this type of material. Although the study did not directly discuss the formulation details of light stabilizers or antioxidants, its conclusions on temperature activated degradation provide a reference experimental basis for the design of stabilization and destabilization of degradable polyesters.

Detection characterization and follow-up attention

This study was published in a professional journal in the field of polymer degradation, and its conclusion is based on the observation of degradation behavior under aerobic composting conditions.

. For the industry, it is worth paying attention to how to characterize the degradation kinetics of enzyme embedded PBAT under different composting temperature curves, how the changes in molecular weight, crystallinity, and surface morphology during the degradation process correspond to the composting stage, and whether these characterization results can be converted into operational detection methods. The advancement of these issues will help to incorporate the degradation behavior of degradable polyesters into a more systematic framework for evaluating polymer aging and stabilization.

Information source:Thermophilic temperatures activate self-biodegradation of enzyme-embedded PBAT under aerobic composting， Organized by Herun Chemical.