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REVISION CARDS - MODELS AND PROTOTYPES
V. Ryan © 2013-2017
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Polymers / plastics have a reputation of being environmentally unfriendly. They take years and in some cases centuries to decay. However, plastic bags made from Polylactide (PLA) take only five years to decompose. Containers such as drinking bottles and food containers manufactured from PLA, take slightly longer to decay, as they are manufactured from thinker material.
Polylactide is referred to as a ‘bioplastic’ because of its environmentally friendly nature.
BIO DEGRADABLE PLASTICS
FROM CORN STARCH
Corn starch is a renewable material, as it is produced from plants and NOT from oil.
It is biodegradable / compostable, decomposing over a short period of time.
Traditional plastic can take centuries to decompose, polluting the surrounding environment.
Sandwich cartons, such as the one shown opposite, are often made from
environmentally friendly materials.
The window of the food carton ( seen above) has been manufactured from corn starch rather than traditional plastics derived from oil. Explain why corn starch has been chosen. 4 marks
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