A-LevelChemistryPolymerisation9701/42 · Oct/Nov 2018 · Q78 Marks
(a) Polyurethanes are polymers made by the reaction of a diisocyanate with a diol as shown. R¹ and R² are hydrocarbon groups. [Figure 7.0] Lycra® is a polyurethane formed from the diisocyanate P and HOCH2CH2OH. [Figure 7.1]
- (a)(i)Give the molecular formula for P.[1]
- (a)(ii)Draw the repeat unit of Lycra®.[2]
- (a)(iii)Fibres of Lycra® are strong due to the intermolecular forces between the polymer chains. Complete the table to identify two intermolecular forces responsible for this property and the group(s) involved. intermolecular force | group(s) involved[2]
- (b)Name one example of each of the following types of polymer. type of polymer | example synthetic polyamide synthetic polyester conducting polymer non-solvent based adhesive[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [1] C15H10N2O2
- [1] -NH-CO-O- linkage
- [1] whole molecule correct
- [1] M1 hydrogen bonding
- [1] M2 NH group for hydrogen AND second correct IMF
- [1] one mark for each correct answer up to a maximum of [3]
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