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Low density polyethylene (LDPE) is used to make flexible products such as cling-film, sandwich bag
squeeze bottle and grocery bag, while high density polyethylene (HDPE) is used to make milk jug and
detergent bottles. What are the differences in the structure and properties of these two types of
polymer? How does the molecular structure (such as chain branching, crystallinity) of these polymers
influence their physical and mechanical properties?

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• LDPE is softer and more flexible than HDPE. It also has a lower melting point (115° C) and is more transparent. Compared to HDPE, it is more likely to crack under stress. HDPE is rigid and durable and offers greater chemical resistance •

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