Polyester | Johnstone’s triangle | 14–16 years

Develop learners’ thinking about the properties of polyester at three different conceptual levels: macroscopic, sub-microscopic and symbolic. This resource is made up of a single-page Johnstone’s triangle worksheet, which helps learners connect their understanding of the macroscopic uses of polyester in everyday life, with symbolic representation of polyester and sub-microscopic thinking about condensation polymerisation. The teacher guidance includes model answers.