Addition polymerisation

2 marks · Normal

Give the name of the addition polymer formed from tetrafluoroethene, and draw its repeat unit using displayed formulae.

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Poly(tetrafluoroethene). Repeat unit: —CF2—CF2— (displayed, bracketed, with n).

Must show: Correct name (poly(tetrafluoroethene) or PTFE), Correct repeat unit structure (all F atoms shown, bracketed with n subscript)

Also accept: PTFE permitted for name; Displayed formula with full F atoms or structural

Common mistakes: Omitting some F atoms or using incorrect formula

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Marking points

B1 · 1 mark · States correct name of polymer (poly(tetrafluoroethene) or PTFE)

B2 · 1 mark · Draws correct repeat unit —CF2—CF2— with correct bonds, brackets and n subscript

Worked solution

The polymer is called poly(tetrafluoroethene) (or PTFE).