# Describe how the structure of poly(chloroethene), also known as PVC, relates to its use as an electrical insulator.

> Edexcel GCSE Chemistry (1CH0) — 10.4 Polymers (Chem only) · Describe · 4 marks

> Poly(chloroethene), or PVC, is an addition polymer made from chloroethene monomers. It is widely used as an insulating coating on electrical wires.

## Mark scheme (4 marks)

1. PVC is made from many chloroethene monomers joined together by addition polymerisation, forming long chain molecules
2. The long polymer chains are covalently bonded throughout, with no ions or free electrons present
3. Because there are no free electrons (or ions), PVC does not conduct electricity
4. This makes PVC a suitable electrical insulator, preventing current from passing to the outside of the wire and reducing the risk of electric shock

## Key terms

- [electrical insulator](https://www.gradenine.co.uk/glossary/electrical-insulator)

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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-how-the-structure-of-poly-chloroethene-608eda4a) · Published by Druglandscape Ltd.