Academic journal article The Science Teacher

Plant-Based Plastics

Academic journal article The Science Teacher

Plant-Based Plastics

Article excerpt

An analysis of plant and petroleum-derived plastics by University of Pittsburgh (Pitt) researchers suggests that biopolymers are not necessarily better for the environment than their petroleum-based relatives, according to a report in Environmental Science & Technology. The Pitt team found that while biopolymers are a more eco-friendly material, traditional plastics can be less environmentally taxing to produce.

Biopolymers trumped the other plastics for biodegradability, low toxicity, and use of renewable resources. Nonetheless, the farming and chemical processing needed to produce them can devour energy and dump fertilizers and pesticides into the environment, according to lead author Michaelangelo Tabone, who conducted the analysis as an undergraduate student in the lab of Amy Landis, a professor of civil and environmental engineering in Pitt's Swanson School of Engineering.

Tabone and Landis worked with James Cregg, an undergraduate student in Pitt's School of Arts and Sciences, and Eric Beckman, codirector of Pitt's Mascaro Center for Sustainable Innovation and the George M. Bevier Professor of Chemical and Petroleum Engineering in Pitt's Swanson School.

The researchers examined 12 plastics: 7 petroleum-based polymers, 4 biopolymers, and 1 hybrid. The team first performed a life-cycle assessment (LCA) on each polymer's preproduction stage to gauge the environmental and health effects of the energy, raw materials, and chemicals used to create 1 oz. of plastic pellets. They then checked each plastic in its finished form against principles of green design, including biodegradability, energy efficiency, wastefulness, and toxicity.

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The LCA revealed that biopolymers were among the more prolific polluters on the path to production. …

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