A student tests an unknown polymer and finds it cannot be softened by heating. Which conclusion is most appropriate?

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Question

A student tests an unknown polymer and finds it cannot be softened by heating. Which conclusion is most appropriate?

Accepted Answer

The polymer is a thermosetting plastic — Thermosetting plastics have cross-linked polymer chains that prevent softening on heating, so inability to soften on heating identifies a thermosetting plastic. Thermoplastics soften on heating because their chains are not cross-linked. The method of polymerisation (addition or condensation) does not directly determine whether a polymer softens on heating. The elemental composition alone does not determine thermal behaviour.

Answer

The polymer was made by addition polymerisation

Answer

The polymer is a thermoplastic

Answer

The polymer contains only carbon and hydrogen atoms

Answer

The polymer is a thermosetting plastic

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