Review of durability of polylactic acid degradation in vivo and simulated in vitro: Progress in accelerated testing and life prediction models

A review article titled “Mechanical Durability and Degradation of Poly (lactic acid) under Vivo and Simulated in vitro Conditions: A Review of Accelerated Testing and Lifetime Treatment Modeling” was published in Volume 254 of Polymer Degradation and Stability (December 2026) by Soo Hyun Woo and Jung Wook Wee. The article systematically reviews the mechanical durability and degradation behavior of polylactic acid (PLA) in both in vivo and simulated in vitro conditions, with a focus on the research progress of accelerated testing strategies and life prediction models.

Accelerated testing and life prediction are the core topics

This review takes accelerated testing and life prediction modeling as the organizational mainline, discussing how to shorten the evaluation cycle through experimental condition design, and using the model to extrapolate the performance evolution of materials in actual use environments.

. For degradable polymers, the correlation between degradation rate and mechanical property degradation is crucial for evaluating their durability, while the correspondence between acceleration conditions and the real environment directly affects the reliability of prediction conclusions. The article summarizes and compares existing methods, providing methodological references for subsequent research.

Significance of research on polymer aging and stabilization

From the perspective of polymer aging and stabilization technology, the degradation evaluation of polylactic acid shares several fundamental issues with traditional weather stability research: how environmental factors drive molecular chain breakage and performance degradation, how accelerated testing can reasonably simulate long-term exposure, and how life prediction models can incorporate the influence of material formulation and processing history.

. The accelerated testing and modeling ideas summarized in this review can provide reference for the aging research of degradable polyester systems, and also suggest the need to distinguish the dominant mechanisms of hydrolysis degradation and oxidation degradation when evaluating antioxidant systems and photo stable systems. In the design of stabilization formulas, the introduction of light stable components such as HALS and UVA, as well as antioxidant systems, often needs to be selected based on specific degradation pathways; For materials such as polylactic acid that are sensitive to hydrolysis, the synergistic effect of the composite system needs to be verified under accelerated conditions. The mechanical durability evaluation and life prediction framework emphasized in this review helps establish a link between formulation variables and long-term performance, thereby improving the predictability of stabilization schemes.

Methodological Implications and Unclear Points

The review itself mainly focuses on method sorting, and does not provide a unified acceleration factor or model parameter conclusion at the abstract level.

. When borrowing from its framework, readers still need to verify it in conjunction with specific material grades, product thickness, and usage environments. Overall, this article provides a structured reference path for the aging evaluation of degradable polymers, and has methodological value for the design of stabilization systems and the selection of detection and characterization methods in the polymer additive industry.

Information source:Mechanical durability and degradation of poly(lactic acid) under <em>in vivo</em> and simulated <em>in vitro</em> conditions: A review of accelerated testing and lifetime-prediction modeling， Organized by Herun Chemical.