Heat-resistant polylactide fibers: An in-depth review of research developments

Polylactide (PLA), a degradable bio-based polymer, is widely used in bio-based fibers due to its excellent processability, low cost, and environmental friendliness, which supports the solution of global pollution and environmental problems. However, pure PLA fibers exhibit poor thermal stability and mechanical properties in high-temperature scenarios, significantly limiting their practical applications. Additionally, existing literature lacks comprehensive and systematic reviews on strategies for optimizing their high-temperature performance. This review critically examines the methods and recent advancements in enhancing the thermal stability of PLA fibers, with a particular focus on synergistic approaches that improve both thermal and mechanical properties. We emphasize that balancing superior heat resistance with retained mechanical integrity remains a pivotal challenge for future research. Furthermore, this review explores the promising applications of heat-resistant PLA fibers in automotive, textile, medical, and smart wearable industries, underscoring their vast potential in advancing fiber technology.