Polymerisation & Plastics 3D | Chemistry Simulation

About this simulation

Polymerisation & Plastics is an interactive 3D materials-chemistry simulation exploring how monomer structure and inter-chain bonding govern the mechanical properties of plastics and rubbers. Three parallel macromolecular chains are anchored between tensile testing clamps. Students can switch between Addition polymerisation (polyethene chains formed by opening C=C double bonds), Condensation polymerisation (alternating co-monomer Nylon chains that release H2O molecules), and Cross-linked Elastomer networks connected by golden covalent disulfide bridges. Dragging the pull clamp stretches the coiled chains outward; releasing the clamp demonstrates how cross-links pull elastomer chains back to their original length while un-crosslinked thermoplastics can slide and deform.

What students can explore

Select Addition (Polyethene) with 0 cross-links, raise Temperature above 400 K, and drag the right Pull Clamp outward to observe plastic chain slip.
Switch to Cross-linked Elastomer with 6 cross-links, drag the Pull Clamp to stretch the network, and release it to watch rapid elastic recoil.
Select Condensation (Nylon) and observe the alternating blue and magenta co-monomer units along with the red-and-white H2O by-product molecules released.
Increase Cross-link density all the way to 10 bridges to form a rigid Thermoset network and feel how strongly the chains resist stretching.
Click directly on any monomer sphere along the polymer chains to add disulfide cross-link bridges and watch the network tighten.

Learning objectives

1Distinguish between addition polymerisation (single monomer, no by-product) and condensation polymerisation (two functional groups, small molecule eliminated).
2Explain how covalent cross-links between polymer chains prevent irreversible sliding and give vulcanised elastomers their elastic memory.
3Compare the molecular structures and thermal behaviours of thermoplastics, elastomers, and thermosets.
4Describe how coiled polymer chains uncoil when stretched in tension and recoil due to entropy and cross-link restoring forces.

Questions teachers ask

What is the difference between addition and condensation polymerisation?

In addition polymerisation, unsaturated alkene monomers (such as ethene) open their carbon-carbon double bonds to join into a single long chain with 100% atom economy and no by-products. In condensation polymerisation, monomers with two functional groups react and eliminate a small molecule such as water (H2O) or HCl at each linkage.

Why do thermoplastics melt when heated while thermosets do not?

Thermoplastics consist of separate polymer chains held together only by weak intermolecular forces that are easily overcome when heated, allowing chains to slide past one another. Thermosets have extensive covalent cross-links tying all chains into one giant 3D network that cannot melt without charring covalent bonds.

How does vulcanisation turn soft rubber into a strong elastic material?

Natural rubber consists of coiled polyisoprene chains that slide past each other when pulled warm. Heating rubber with sulfur (vulcanisation) forms covalent disulfide (-S-S-) cross-links between adjacent chains so the chains can uncoil when stretched but snap back to their original positions when released.

What is the degree of polymerisation (n)?

The degree of polymerisation (n) is the number of repeating monomer units linked together in an average polymer macromolecule, often ranging from hundreds to tens of thousands in commercial plastics.

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