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Polymers and biomolecules — Question 1

QCAA 2023, Paper 2 · 2 marks

Q1 · 2023 · Paper 2Unclassified2 marks

QUESTION 1 (2 marks)

Polylactic acid (PLA) and low-density polyethylene (LDPE) are both used to produce plastic wrapping film.

Plastic

Composition

Density (g/cm3)

Tensile stress (MPa)

Elongation (%)

Degradation rate

PLA

plant-based

1.24

60

6

slow

LDPE

petrochemical-based

0.92

12

148

none

Analyse the data to discuss one advantage and one disadvantage of using PLA rather than LDPE to produce plastic wrapping film.

Advantage:

Disadvantage:

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