Research Trends in Biodegradable Polymers (PLA and PEF) for Sustainable Plastic Waste Management: A Bibliometric Study

Plastic has become a defining material of the modern world, yet its persistence in the environment has created a crisis. Conventional plastics, made from petroleum, can sit in landfills or float in the ocean for centuries, breaking down into tiny, harmful fragments that enter the food chain. In response, scientists have turned to biodegradable polymers, materials designed to break down naturally after use. Two specific types have risen to the forefront of this effort: polylactic acid, often called PLA, and polyethylene furanoate, known as PEF. PLA is made from fermented plant sugars like corn or sugarcane, while PEF is synthesized from plant-based acids. Both offer a promise of a cleaner future, but the path from the laboratory to widespread use is complex. Researchers must understand not just how these materials are made, but how they behave in the real world, how they are produced on a large scale, and whether they truly solve the problem of plastic waste.

To map the progress of this field, a team of researchers conducted a massive review of scientific literature published between 2000 and 2025. They did not perform new experiments in a lab; instead, they analyzed 2,043 existing research articles from a major scientific database. By using computer tools to count publications, track who wrote them, and see how often specific words appeared together, they created a detailed picture of how the science of biodegradable plastics has evolved. This approach, known as bibliometric analysis, allowed them to see the big picture of global research efforts, identifying which countries are leading, what topics scientists are obsessed with, and where the gaps in knowledge remain.

The results show a field that is exploding with activity. The number of research papers on these materials has grown by about 17 percent every year, with a sharp acceleration occurring after 2015. This surge coincides with global policy shifts aimed at reducing plastic pollution and the rise of the circular economy, a system where materials are reused rather than discarded. The research is not evenly spread across the globe. China produces the highest volume of papers, followed by Italy and the United States. While China leads in the sheer number of studies, the United States and several European nations often produce work that is cited more frequently by other scientists, suggesting a strong influence on the direction of the field. The study also revealed that scientists rarely work alone; the average paper has more than five authors, and these researchers form tight-knit groups that collaborate heavily within their own regions, though connections between different countries are also strong.

When the researchers looked at what these scientists are actually studying, four main themes emerged. The first and largest group of research focuses on making the materials stronger and more durable. Scientists are constantly tweaking the chemical structure of PLA and PEF to improve their stiffness and heat resistance, trying to make them as useful as traditional plastics. A second theme involves mixing these bioplastics with other natural materials, such as fibers from plants or starch, to create composites that are better suited for real-world applications like packaging. The third theme addresses the core promise of these materials: how they break down. Researchers are deeply concerned with biodegradation, studying how fast these plastics decompose in soil, water, or industrial composting facilities. The fourth theme looks toward the future, exploring advanced technologies like 3D printing and the use of tiny nanoparticles to give these materials new, high-tech functions.

Despite this rapid growth, the study highlights significant hurdles that prevent these materials from replacing conventional plastics entirely. One major issue is that the conditions required for these plastics to break down are often very specific. While PLA can decompose efficiently in a hot, controlled industrial composting facility, it may sit unchanged for years in a cool ocean or a temperate forest. This gap between laboratory success and real-world performance creates confusion about whether these materials are truly sustainable solutions. Furthermore, the cost of producing these bioplastics remains high, often two to three times more expensive than standard petroleum-based plastics, which limits their ability to compete in the open market. The research also points to a lack of global agreement on how to define and test "biodegradability," making it difficult for companies and governments to create consistent rules.

The paper concludes that while the science is advancing quickly, the transition to a sustainable plastic future is not yet complete. The most promising immediate applications appear to be in food packaging, where the superior barrier properties of PEF can help keep food fresh longer, and in the medical field, where PLA is already used for surgical implants and drug delivery systems because it is safe for the human body. Another potential area is agricultural films that can be plowed directly into the soil to decompose, eliminating the need to collect and dispose of dirty plastic mulch. However, for these materials to become the norm, the scientific community must work together to standardize testing methods, lower production costs, and develop policies that support their use. The research landscape is vibrant and full of innovation, but turning these promising materials into a global solution requires bridging the gap between scientific potential and practical, everyday reality.