... One solution to this environmental disaster is biodegradable plastic. It is a polymer created by the combination of two monomers: modified ethylene glycol and purified terephthalic acid. PBT is closely related to other thermoplastic polyesters. Oxo-biodegradable and Enzyme mediated plastics .
Developed at Israel’s Ben-Gurion University, bacteria called Pseudomonas putida are genetically modified to “eat” polyethylene-terephthalate (PET), a common type of plastic that’s proliferating in the oceans and on the land. PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150 °C (or 200 °C with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible. Polyethylene terephthalate (PET ), a synthetic polyester material made of diethyl terephthalate (DET ) monomers, is widely used in plastic products of daily life and caused serious pollution to the global environment. Furthermore, the biodegradable plastics have been used to reduce the environmental impact (in terms of energy requirement from nonrenewable resources and CO 2 gas emissions) derived from production, utilization, and disposal of petroleum‐based plastics, like polyethylene terephthalate (PET). PLA looks and behaves like polyethylene and polypropylene and is widely used for food containers. Polyethylene terephthalate (PET) is a highly recyclable plastic resin and a form of polyester. Drop the same bottle into a landfill, however, and you might have second thoughts. PET was pyrolised at 450 °C resulting in the production of a solid, liquid, and gaseous fraction. Polyethylene Terephthalate or PET products are 100% recyclable and is the most recycled plastic worldwide. The conversion of the petrochemical polymer polyethylene terephthalate (PET) to a biodegradable plastic polyhydroxyalkanoate (PHA) is described here. PLA also produces almost 70 percent less greenhouse gases when it breaks down in landfill sites. Acetyl cellulose (AcC) is either biodegradable or non-biodegradable, depending on the degree of acetylation. Low diffusion coefficient makes PET much more suitable than other plastic materials for use as a recovered, recycled material.
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