1, photodegradable plastics. Refers to the orderly decomposition of polymer chains under the influence of ultraviolet rays. Most polymers do not absorb light energy with a wavelength exceeding 285 nm. However, if photosensitive groups or chemical additives with photosensitive effect are added to the polymer, the process of photooxidation reaction can be accelerated and it can be degraded quickly.

2. Biodegradable plastics. Judging from the biodegradation process, it can be divided into two categories: complete biodegradation and biodegradable plastics; Considering the preparation method, it can be divided into four types: biological fermentation synthesis, chemical synthesis and utilization of natural polymers or minerals in animals and plants.

3, light, oxidation/biological comprehensive degradation of plastics. It is a combination of photodegradation, oxidative degradation and biodegradation to achieve complete degradation. It is one of the main research and development directions of degradable plastics in the world at present. The research on this kind of plastic has achieved good results in the United States, and it is still one of the more difficult research topics in China.

4. Thermoplastic starch resin degrades plastics. Starch molecules are deformed out of order to form thermoplastic starch resin, and a very small amount of plasticizer and other additives are added, which is the so-called full starch plastic. Among them, the starch content is above 90%, and a small amount of other substances added are non-toxic and can be completely degraded, so the whole starch is a truly completely degradable plastic.