From: The Chemistry of Connection: How Polymerization Built the Modern World

How can you tell if a plastic is truly recyclable?

The recycling numbers on the bottom of plastic items tell you exactly what kind of polymer you are holding. Not all polymer chains can be melted down and reformed easily. Thermoplastics (like PET soda bottles) can be remelted, while thermosetting plastics (like epoxy) burn instead of melting, making them virtually impossible to recycle in traditional ways.

Action

Examine the plastic containers in your kitchen. Sort them by their recycling numbers to see which polymers your local municipality actually collects.

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What else is in this exploration

3 evidence blocks3 perspectives4 visualizations9 media resources11 rabbit holes

evidence

Nature is the original and most prolific polymerizer, creating DNA, proteins, and cellulose.

evidence

Polymerization occurs through two distinct chemical pathways: addition and condensation.

evidence

Synthetic polymerization transformed human material culture starting in the early 20th century.

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The Chemistry of Connection: How Polymerization Built the Modern World

Evidence, perspectives, rabbit holes, and more