Degradable materials are those that can be broken down by microorganisms in the natural environment into carbon dioxide, water, and other harmless substances. These materials play a crucial role in reducing environmental impact and white pollution.
There are several types of degradable films commonly used for recyclable applications. Biobased degradable plastics, such as PLA (Polylactic Acid) and PHA (Polyhydroxyalkanoates), are derived from plants or microorganisms. These materials offer a sustainable alternative to traditional plastics. Petroleum-based degradable plastics, like PBAT (Polybutylene Adipate Terephthalate), are made from petrochemical products but are also designed to degrade naturally. Cellulose fibers, sourced from renewable plant materials like sugarcane fiber, wheat straw, and wood pulp, are another example of degradable materials used in films. Additionally, chitin-based fibers, which come from shellfish, possess unique biodegradability and biological activity.
The degradation methods for these materials vary. Biodegradation, as seen in PLA and PBAT, involves the breakdown of polymers by microorganisms. Photodegradation uses light to break down materials, while a combination of light and biological degradation can also occur. Some materials, such as certain cellulose-based films, degrade through water interactions.
The advantages of these films are considerable. They are eco-friendly, naturally degrading to reduce plastic waste, and safe to use as they are non-toxic and sometimes have natural antibacterial properties. Furthermore, these materials offer excellent physical properties, including breathability and moisture-wicking capabilities, making them ideal for a wide range of applications. They are commonly used in packaging, textiles, agriculture, and medical fields, demonstrating their versatility in sustainable practices.