Polylactic acid (PLA) granules are a biodegradable and bio-based thermoplastic polyester derived from renewable agricultural sources such as corn, rice, and starch. Synthesized from lactic acid monomers via fermentation of glucose or sucrose, PLA has gained global prominence as a sustainable alternative to petroleum-based plastics. Its excellent balance of strength, biocompatibility, and processability makes it one of the most widely used biopolymers in both industrial and biomedical applications.
Material Overview
PLA is produced through the ring-opening polymerization of lactide, yielding a polymer with high tensile strength, stiffness, and transparency (Hamad et al., 2015). Its mechanical properties are comparable to those of polyethylene terephthalate (PET), though PLA has a lower continuous use temperature, typically around 60 °C (Pang et al., 2010). The polymer’s crystallinity, molecular weight, and copolymer composition can be adjusted to tailor its mechanical performance and degradation rate. Chemically, PLA degrades primarily by hydrolysis of its ester linkages into lactic acid, a naturally occurring compound that is metabolized by the human body, ensuring complete biocompatibility (Lu & Mikos, 2009).
PLA also exhibits excellent optical clarity, low toxicity, and resistance to fats and oils. Its degradation kinetics can be tuned by modifying molecular structure, blending with other biopolymers, or incorporating fillers such as calcium carbonate and magnesium hydroxide. These modifications enhance heat resistance, toughness, and cost-effectiveness, enabling PLA to compete with conventional polymers in demanding applications (Qingping, 2016; Naser et al., 2021).
Applications and Advantages
Biomedical applications. PLA’s biodegradability and bioresorbability make it ideal for medical and pharmaceutical applications. It is used in absorbable sutures, orthopedic fixation devices, dental implants, and controlled drug delivery systems (Lu & Mikos, 2009). In tissue engineering, PLA scaffolds provide temporary support for regenerating tissues, gradually degrading as new tissue forms.
Industrial and environmental uses. In packaging and consumer goods, PLA granules are molded into biodegradable containers, films, and shopping bags. When compounded with additives such as citrate plasticizers and nano-calcium carbonate, PLA achieves greater flexibility and temperature resistance, expanding its usability in food packaging and disposable products (Qingping, 2016). The polymer’s compostability and recyclability—through both mechanical reprocessing and chemical depolymerization back to lactic acid—contribute to its strong environmental profile (Pang et al., 2010).
Engineering and advanced materials. PLA’s potential extends to textiles, 3D printing filaments, and blended composites with other biodegradable polymers. Such combinations yield improved strength, heat tolerance, and flexibility, facilitating the production of engineering-grade materials for automotive and electronic components (Naser et al., 2021). The continued development of PLA composites underscores its role as a key player in the transition toward a circular materials economy.
Goodfellow Availability
Goodfellow supplies high-quality PLA granules for use in research, additive manufacturing, and sustainable industrial production. Our PLA materials can be customized in molecular weight and form to meet specific processing and performance requirements. Whether for biomedical innovation or eco-friendly product development, Goodfellow’s PLA offers a renewable and reliable solution for modern applications.
Explore Polylactic Acid (PLA) Granules and other advanced materials in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Lu, L., & Mikos, A. G. (2009). Poly(lactic acid). https://doi.org/10.1093/oso/9780195181012.003.0134
- Pang, X., Zhuang, X., Tang, Z., & Chen, X. (2010). Polylactic acid (PLA): Research, development and industrialization. Biotechnology Journal. https://doi.org/10.1002/BIOT.201000135
- Hamad, K., Kaseem, M., & Deri, F. (2015). Polylactic Acid: Properties and Applications. https://doi.org/10.1081/E-EBPP-120050007
- Naser, A., Deiab, I., & Darras, B. M. (2021). Poly(lactic acid) (PLA) and polyhydroxyalkanoates (PHAs), green alternatives to petroleum-based plastics: a review. RSC Advances. https://doi.org/10.1039/D1RA02390J