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The following extract was taken from a blog about environmental issues - HSC - SSCE Chemistry - Question 27 - 2011 - Paper 1
Question 27
The following extract was taken from a blog about environmental issues. Assess the uses of polystyrene and a named biopolymer in terms of their properties, with ref... show full transcript
Worked Solution & Example Answer:The following extract was taken from a blog about environmental issues - HSC - SSCE Chemistry - Question 27 - 2011 - Paper 1
Step 1
Assess the uses of polystyrene
Answer
Polystyrene is a versatile plastic commonly used in products such as packaging materials, disposable cutlery, and insulation. Its properties include light weight, rigidity, and resistance to moisture, making it suitable for various applications.
However, polystyrene has significant environmental drawbacks. It is not biodegradable, persists in the environment for hundreds of years, and is often found littering landscapes and oceans. The production and disposal of polystyrene can lead to pollution and habitat destruction, raising concerns about its sustainability.
Step 2
Assess the uses of a named biopolymer
Answer
For comparison, one can consider polylactic acid (PLA), a well-known biopolymer derived from renewable resources like corn starch. PLA is used in food packaging, disposable tableware, and 3D printing due to its compostability and lower environmental impact.
PLA has properties such as good thermal stability, clarity, and a lower carbon footprint compared to polystyrene. However, it also requires specific conditions to decompose fully, and its production can compete with food resources. Thus, while PLA presents a more environmentally friendly option, it is not without challenges.
Step 3
Reference to the statements made in this blog
Answer
The assessment of both materials highlights the trade-offs between convenience and environmental responsibility. The blog likely emphasizes the need for considering alternatives to polystyrene, showcasing biopolymers like PLA as viable options. Ultimately, the choice between these materials must consider their properties, uses, and broader environmental implications.