Images for biodegradable bags are made of polymers and what other substance

Release time:2023-09-22 Number of views: 44

Images for Biodegradable Bags are Made of Polymers and What Other Substance?


Biodegradable bags have gained popularity in recent times due to their environmental benefits. These bags are designed to break down naturally over time, reducing the negative impact on our planet. They are generally made from polymers and other substances that help facilitate their decomposition. In this article, we will discuss the polymers used in making biodegradable bags and the other substances that are combined with them.

Polymers in Biodegradable Bags:

Polymers are long chains of molecules that are formed from repeating units called monomers. In the case of biodegradable bags, the most commonly used polymers include polylactic acid (PLA), polyhydroxyalkanoates (PHA), and polybutylene adipate terephthalate (PBAT).

PLA is derived from renewable resources, such as corn or sugarcane. It has gained popularity as an alternative to traditional plastics due to its biodegradability and lower carbon footprint. PLA can degrade into natural compounds, such as water and carbon dioxide, under certain conditions. This polymer has many applications, including packaging materials, disposable cutlery, and even 3D printing.

PHA is another type of biodegradable polymer that is derived from bacteria. It can be produced using various feedstocks, including plant sugars, starches, and waste materials. PHA is known for its ability to break down in both aerobic and anaerobic environments, making it an excellent choice for biodegradable bags. Additionally, this polymer is compostable, meaning it can be used as fertilizer once it has fully degraded.

PBAT is a copolymer made from adipic acid, terephthalic acid, and 1,4-butanediol. It enhances the mechanical properties of the biodegradable bags, making them more durable and flexible. PBAT has good solubility in water and can degrade in both industrial composting facilities and home compost piles. This polymer also acts as a compatibilizer, allowing easier blending with other polymers.

Other Substances:

Apart from polymers, biodegradable bags may contain additional substances to enhance their performance and biodegradability. These substances can include plasticizers, fillers, and additives.

Plasticizers are added to increase the flexibility and softness of the bags. They help in reducing the brittleness of polymers and improve their resistance to cracking. Common plasticizers used in biodegradable bags include citrate esters and epoxidized soybean oil.

Fillers, such as wood fibers or starch, can be added to increase the strength and stiffness of the bags. These fillers have the added benefit of reducing the overall polymer content, making the bags more environmentally friendly.

Additives are included to enhance the biodegradability of the bags. These additives can speed up the degradation process, making the bags break down faster. Examples of additives used in biodegradable bags include pro-oxidants and bio-based enzymes.


Biodegradable bags are made from polymers such as PLA, PHA, and PBAT. These polymers provide the bags with their necessary structural properties and biodegradability. Additionally, substances like plasticizers, fillers, and additives are added to enhance their performance and speed up the degradation process. As we continue to strive for a more sustainable future, the development and use of biodegradable bags will play a significant role in reducing plastic waste and protecting our environment.