Biodegradable Polymers

Question 1

Starch Based Polymers

Answer 1

Production of medicine capsules and packaging (sometimes)

Question 2

Polylactides

Answer 2

Derived from natural resources; transparent with similar properties to Polyethylene. Can be processed in similar ways to conventional thermoplastics. Uses: Bottles, carrier bags, 3d printing, disposable nappies, plant pots and medical implants

Question 3

Biopol

Answer 3

Harvested from bacteria growing in cultures. Similar to HDPE for products with only a few years life span. Uses: Boxes and crates, garden furniture.

Question 4

PHB

Answer 4

Similar properties to polypropylene. Fully compostable – will break down completely when in contact with micro-organisms in soil. Uses: Packaging and medicine.

Question 5

Cellulose acetate

Answer 5

A naturally occurring polymer obtained from wood fibre. This is treated with acetic acid to form cellulose acetate. First produced in late 19th century, this can be spun into textile fibres, moulded into solid plastic parts, or cast into film. Uses: Textiles, packaging and other products.

Question 6

Oxo-degradable polymers

Answer 6

These polymers have short degradation times – typically less than 5 years rather than 100+. Additives cause the polymer to break down into a fine powder, making it easier to digest for micro-organisms. Uses: disposable products such as plastic cups.

Question 7

Photo-degradable polymers

Answer 7

These breakdown when exposed to UV light, making them more readily biodegradable. Uses: disposable shopping bags.

Question 8

Water-soluble polymers

Answer 8

A more recent and growing area of development. These dissolve in water. Uses: Laundry in hospitals/ plastic on dishwasher tablets