How are Biodegradable Plastic Bags Degradable?

At present, there is no unified international standardized definition of Biodegradable Plastic Bags in the world, but the definition of biodegradable plastic bags is usually: under certain environmental conditions, its chemical organization changes significantly, and standard test methods can be used. The molecular chain of biodegradable plastic bags can be biodegraded by microorganisms in the garbage disposal system or the natural environment, and finally become carbon dioxide and water, which enter the biological combined cycle process, which is completely environmental Assumed, no polymer is left.

Biodegradable Plastic Bags

Degradation mechanism of biodegradable plastic bags

Most synthetic pure polymers have the ability to resist microbial attack. But additives (such as plasticizers, slip agents, pigments and antioxidants, etc.) reduce this ability. Plasticizer residual fatty acids such as stearate can be degraded by microorganisms and cause damage to the polymer surface and performance and even the basic structure. It is known that the degradation of natural polymers by microorganisms is accomplished by enzyme proteins produced by biosynthesis. These enzyme proteins can land on the cell wall or exist in the cell's protoplasmic structure. Some enzymes can sneak into the surrounding environment, and some enzymes stay in the cell and are only released when the cell is lysed or mechanically broken. Enzymes have only highly specific catalytic ability for biochemical reactions, and they proceed quickly under suitable physiological conditions.

There are two degradation methods for Biodegradable Bags, which can be divided into:

(1) Biophysical degradation method: When microorganisms attack and erode high polymer materials, the growth of biological cells causes the polymer components to be hydrolyzed, ionized or protonated and split into oligomer fragments, and the polymer molecular structure remains unchanged. It is the degradation process of polymer biophysical action.

(2) Biochemical degradation method: Due to the direct action of microorganisms or enzymes, the polymer is decomposed or oxidized into small molecules, and finally decomposed into carbon dioxide and water. This degradation method is a biochemical degradation method.

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