Degradation Behaviors of Polylactic Acid Composites
Summary
Polylactic acid composites undergo degradation through mechanisms including hydrolysis, photodegradation, thermal ageing and enzymatic attack. In aqueous environments, water penetrates the polymer matrix, cleaving ester bonds and reducing molecular weight in a bulk or surface erosion mode. Incorporation of fillers such as nanoclays, metal-oxide nanoparticles and organic nucleating agents modifies water uptake, crystallisation behaviour and light absorption, thereby tailoring the rate and pattern of degradation. Photodegradation under ultraviolet irradiation generates free radicals that catalyse chain scission or crosslinking, altering mechanical and thermal properties. Thermal ageing and mechanical stresses further influence polymer crystallinity and fibre morphology, impacting long-term stability in applications ranging from packaging to biomedical scaffolds. By adjusting composite constituents and processing conditions, researchers aim to balance environmental performance with functional durability, offering pathways towards tailored lifespans and improved end-of-life options for sustainable materials.
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Degradation Behaviors of Polylactic Acid Composites publication trend
The graph below shows the total number of articles in degradation behaviors of polylactic acid composites across all publications each year (not limited to Nature Index journals).
Technical terms
Polylactic acid (PLA): A biodegradable aliphatic polyester derived from lactic acid, widely used in packaging and biomedical devices.
Nanocomposite: A polymer matrix reinforced with nanoscale fillers to enhance mechanical, thermal or barrier properties.
Hydrolytic degradation: Cleavage of polymer chains by reaction with water, leading to reduction in molecular weight.
Photodegradation: Breakdown of polymer chains induced by absorption of ultraviolet or visible light.
Chain scission: The process of breaking covalent bonds within polymer chains, lowering molecular weight and altering material properties.
Crystallinity: The extent of ordered, crystalline regions within a polymer that influence stiffness, thermal stability and barrier performance.
References
- Photodegradation and Biodegradation of Poly(Lactic) Acid Containing Orotic Acid as a Nucleation Agent. Materials (2019).
- Effect of Artificial Weathering on PLA/Nanocomposite Molecular Weight Distribution. Polymers (2015).
- Effects of Rutile–TiO2 Nanoparticles on Accelerated Weathering Degradation of Poly(Lactic Acid). Polymers (2020).
- Influence of ZnO, SiO2 and TiO2 on the aging process of PLA fibers produced by electrospinning method. Journal of Thermal Analysis and Calorimetry (2019).
- Evaluation and Modeling of Polylactide Photodegradation under Ultraviolet Irradiation: Bio-Based Polyester Photolysis Mechanism. Polymers (2024).
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