Example of Bio Polyethylene Terephthalate

Biodegradability is an EOL option for single-use disposable, packaging and consumer plastics that harnesses microbes to completely utilise the carbon substrate and remove it from the environmental compartment through the microbial food chain. 

Terephthalic Acid = 8C Ethylene glycol = 2C biocontent is (20%) Acid component = 68.75% glycol component = (31.25%]on total mass basis 

Biobased plastics, in which the fossil carbon is replaced by biobased carbon from plant-biomass resonrces, offer the intrinsic value proposition of a sustainable, zero material carbon footprint which is in balance with the rates and timescale of the biological carbon cycle. The process carbon and environmental footprint using LCA methodology is important and needs to be conducted as well. However, it does not capture nor convey the true, intrinsic value proposition of the zero material carbon footprint arising from the selection of the plant-biomass carbon resources. Identification and quantification of biobased content is based on the radioactive C-14 signature associated with (new) biobased carbon. Not all biobased plastics are biodegradable and not all biodegradable polymers are biobased. 

Narayan, Biobased Biodegradable Polymer Materials Rationale, Drivers, and Technology Exemplars, American Chemical Society Symposium Series 1114, 2012, p.l3 and American Chemical Society Symposium Series 939, 2006, p.282. 

Graziani and R Fornasiero, CRC Press, Taylor Francis Group, 

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