来源网址：http://www.rsoau.com 2019-01-30 13:48:14
Biodegradable materials can be roughly divided into two categories according to their biodegradation process. One is biodegradable materials, such as natural macromolecule cellulose and synthetic polycaprolactone, whose decomposition effect comes mainly from:
The rapid growth of microorganisms leads to the physical collapse of plastic structures.
(2) Due to the biochemical effects of microorganisms, enzymatic hydrolysis or acid-base hydrolysis;
(3) Free radical chain degradation formed by other factors. The other is biodisintegrating materials, such as the mixture of starch and polyethylene, whose decomposition effect is mainly due to the damage of additives and the weakening of polymer chains, so that the molecular weight of polymer can be degraded to the digestible degree of microorganisms, and eventually decomposed into carbon dioxide (CO2) and water.
Biodisintegrating materials are mostly produced by blending polyethylene and polystyrene with starch and photosensitizer.
The objective of the study is that starch-based biodegradable plastic bags will eventually enter the waste yard without touching the sunlight. Even if there are biodegradable effects, biodegradable effects will be the primary one. Tests at certain times show that there is no obvious degradation of waste bags, no natural damage of waste bags, and even play a certain "fresh" effect on the waste in bags.
As for the treatment of environmental pollution, although starch-based plastics are more useful than disposable plastics, polyethylene or polyester materials, which can not be biodegraded, are still used as materials, so in addition to the addition of starch, they can be degraded.
Many of the remaining polyethylene or polyester will remain and can not be completely biodegraded, but decomposed into debris, can not be recovered, the situation is worse after entering the soil, the treatment of waste is disordered, so complete biodegradable materials become the focus of research on degradable materials.
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