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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 in terms of its properties
Answer
Polystyrene is a versatile plastic widely used for various applications, including packaging materials, disposable cutlery, and insulation. One of its key properties is its light weight, making it ideal for packaging. Additionally, polystyrene has excellent thermal insulation properties, which is beneficial in construction. However, its environmental impact must be considered, as polystyrene is not biodegradable and contributes to plastic pollution. In contrast, its durability and moldability make it suitable for various everyday products.
Step 2
Assess the uses of a named biopolymer in terms of its properties
Answer
For the biopolymer, we can consider polylactic acid (PLA). PLA is derived from renewable resources, such as corn starch or sugarcane, making it an eco-friendly alternative to traditional plastics. Its properties include good strength and rigidity, making it suitable for products like biodegradable food containers and 3D printing materials. Unlike polystyrene, PLA is biodegradable under industrial composting conditions, reducing environmental impact. However, its thermal resistance is lower than that of polystyrene, limiting its use in high-temperature applications.
Step 3
Comparison of polystyrene and the biopolymer
Answer
Both polystyrene and PLA have distinct properties that suit different applications. While polystyrene is preferred for its durability and insulation, it poses significant environmental concerns due to its non-biodegradability. On the other hand, PLA offers a more sustainable option, being derived from renewable resources and having biodegradable properties. However, the lower thermal resistance of PLA can limit its uses compared to polystyrene. In conclusion, assessing these polymers involves weighing their practical applications against their environmental impacts.