Photodegradable plastics are photosensitizers mixed into plastics. Under the action of sunlight, the plastics gradually decompose. But its disadvantage is that the degradation time is affected by sunlight and climate environment, so it cannot be controlled.

Biodegradable plastics refer to plastics that can be decomposed into low-molecular compounds by microorganisms that exist in nature, such as bacteria, molds, and algae under certain conditions. Such plastics are convenient for storage and transportation, and have a wide range of applications.

Light/biodegradable plastics are plastics that combine the dual characteristics of light-degradable plastics and biodegradable plastics.

Water-degradable plastics are plastics that can be dissolved in water because of the addition of water-absorbing substances. With the development of modern biotechnology, biodegradable plastics have become a new hot spot in research and development.

Source: 环保科普 | 可降解塑料有哪些？又是如何实现降解呢？_二氧化碳 (sohu.com)