EVERYDAY MATERIALSAtlas
Process theme / simplified industrial explanation

Building polymer chains

Polymer manufacture links chemical building blocks into large molecules. The choice of building blocks, reactions and processing controls the resulting chain structure. Natural polymers also exist, but a synthetic polymer route begins with deliberately prepared chemical feedstocks.

What changes?

Polyethylene, polypropylene and PET have different repeating structures and therefore different behaviours. Copolymers include more than one kind of building block. Commercial resin is often then compounded, dried or otherwise prepared before it is spun, moulded or extruded into a useful form.

What the diagram leaves out

Polymer identity alone does not define a finished plastic. Additives, molecular structure and processing history influence performance. A resin’s ability to soften with heat also does not prove that a local collection system can sort and reprocess a particular product.

What to look for next

Follow the resin into its grade formulation and final geometry, then distinguish thermoplastic shaping from network-forming cure.

Follow a real material.

PET

A clear bottle and a fleece share a polymer.

Polymers

HDPE

A tougher bottle from more orderly chains.

Polymers

LDPE

Branching makes a familiar flexible film.

Polymers

Polypropylene

A moulded hinge that bends again and again.

Polymers

PVC

One polymer, from rigid frames to flexible cable jackets.

Polymers

ABS

A tough shell around a more delicate machine.

Polymers

Polycarbonate

A clear view with more impact tolerance.

Polymers

Nylon

One family can become a bristle or a gear.

Polymers

Silicone

A flexible seal built on a silicon–oxygen backbone.

Polymers

PTFE

A low-friction surface with specific limits.

Polymers

EVA

The link between a cushioned step and a protected solar cell.

Polymers

Epoxy resin

The binder that makes separate parts act together.

Polymers

Follow the evidence

Original explanations informed by the sources below. Technical and industry sources support material behaviour; industry environmental marketing is not treated as a universal comparison. Read our editorial method.