According to foreign media reports, what kind of non-petroleum plastics can be used to achieve both recoverable and biodegradable goals? Chemists have found a polymer that can be synthesized into a useful material and then broken down into its original structural form and regenerated. Although some plastics can be recovered through continuous accumulation and made into useful items, most of them are landfilled into landfills or seas.
Although plastics such as PLA can be degraded under certain conditions, they also have some disadvantages. Although recycling can be used as a method to extend the life cycle of a material, it cannot be decomposed back to its original molecular state without producing other harmful substances.
To find plastics that can be fully recovered and degraded, scientists from the University of Colorado (CSU) turned their attention to molecules extracted from biomass compounds. The U.S. Department of Energy classified this substance as one of the 12 most suitable substitutes for petrochemical products. Early scientific literature has defined the molecule gamma butyrolactone (GBL) as a very promising advanced plastic building material. However, since this material has thermal stability, it cannot be polymerized.
Then, CSU chemistry professor Eugene Chen and colleague Miao Hong collaborated on the research. Eventually they discovered a manufacturing process that can not only use GBL to generate polymers, but also allow the polymers to form different shapes, such as linear, ring. When both metal and non-metal catalysts are involved, researchers heat it to 220 degrees Celsius (for linear polymers) or 300 degrees Celsius (for ring polymers) for an hour and then return the GBL to its original molecular state. .
The research team stated that from a chemical point of view, GBL is the same as commercial bioplastic P4HB, but because the latter is based on bacterial production, it is more costly and the process is more complex. The team hopes that their research results will bring the industry a lower-cost, simpler, recyclable, biodegradable plastic.
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