来源网址：http://www.rsoau.com 2019-02-21 13:39:18
Environmental protection is becoming more and more serious, so more attention has been paid to environmental protection materials such as degradable plastics. So, what are the degradable plastics?
PLA: PLA. It is a new type of bio-base and biodegradable material, which is made of starch material proposed by renewable plant resources such as corn.
Glucose is obtained from starch by saccharification, then high purity lactic acid is produced by fermentation of glucose and certain strains, and then polylactic acid with certain molecular weight is formed by chemical composition. It has excellent biodegradability.
After application, it can be completely degraded by microorganisms in nature under specific conditions, eventually generating carbon dioxide and water, and not polluting the environment. This is very beneficial to the protection of the environment, and is recognized as environmentally friendly information.
PBS: polybutylene succinate. White particles, which are made up of succinic acid and butanediol by condensation and polymerization, are milky white, odorless and odorless. They are easily decomposed and metabolized by enzymes in various microorganisms, animals and plants in nature, and eventually decomposed into carbon dioxide and water. They are typical biodegradable polymer materials.
Excellent biocompatibility and bioabsorbability, good heat resistance, thermal deformation temperature and product application temperature can exceed 100 C. The material source of PBS is not only petroleum resource, but also fermentation of biological resource. PBS is the best guess of biodegradable plastics.
PCL: Polycaprolactone. With excellent biodegradability, biocompatibility and non-toxicity, it has been widely used as medical biodegradable data and drug controlled release system, and can be used in tissue engineering as drug controlled release system.
PHA: Polyhydroxy fatty acid ester. It is a kind of intracellular polyester composed of many bacteria. It exists mainly as a carbon source and a power storage material in organisms.
It has many excellent functions, such as biodegradability, biocompatibility, optical activity, piezoelectricity, gas separation and so on. Polyhydroxyalkanoates in biodegradable packaging materials.
Tissue engineering data, slow-release data, electrical data and medical data have broad prospects for use, but only after reducing the cost of production of PHA may large-scale use.
PBAT: Polyadipic acid/butylene terephthalate. PBAT belongs to thermoplastic biodegradable plastics. It is a copolymer of butylene adipate and butylene terephthalate. It has the characteristics of PBA and PBT, and has good ductility and cracking elongation.
In addition, it has excellent biodegradability, which is one of the most active and best degradable materials in the research of biodegradable plastics.
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