The environmental protection wind is gradually degrading the trend of plastics. How much do you know about him?
Degradable plastic refers to a type of plastic whose properties meet the requirements of use, has the same performance during the storage period, and can be degraded into environmentally friendly substances under natural environmental conditions after use. Therefore, it is also It is called environmentally degradable plastic.
Degradation of a polymer refers to the process of breaking up a polymerized macromolecular ingot due to chemical and physical factors. The polymer is exposed to oxygen, water, heat, radiation, chemicals, pollutants, and mechanical forces. The degradation process of macromolecular chain breaks under environmental conditions such as insects and microorganisms is called environmental degradation. Degradation causes the molecular weight of the polymer to decrease, and the physical properties of the polymer material to decrease until the polymer material loses its usability, a phenomenon also known as aging degradation of the polymer material.
Both natural polymers and synthetic polymers degrade under exposure to environmental conditions, but under the same environmental conditions, the degradation sensitivities of various polymers, especially synthetic polymers, are quite different, and thus, various polymers The solvability is also different. For example, polypropylene is easily degraded under photo-oxygen conditions, while polystyrene is difficult to degrade under the same environmental conditions. Polyvinyl alcohol is more susceptible to degradation under the environmental conditions of certain microorganisms. However, polyethylene, polypropylene, and polystyrene are difficult to degrade under the same environmental conditions.
The degradation process of environmentally degradable plastics mainly involves biodegradation, photodegradation and chemical degradation. Moreover, these three main degradation processes have synergistic, synergistic and coherent effects. For example, photodegradation and oxide degradation often occur simultaneously and promote each other; biodegradation is more likely to occur after the photodegradation process.
The aging degradation of the polymer is directly related to the stability of the polymer. Aging degradation of the polymer shortens the life of the plastic. For this reason, since the advent of plastics, scientists have been working on anti-aging, stabilization studies of such materials to produce highly stable polymer materials, and scientists in various countries are now using aging degradation of polymers. Behavioral competition to develop environmentally degradable plastics.
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