4h
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Polymerisation
• A large number of monomers joining together form a polymer
Addition polymerisation
• Only one polymer is formed Advantages: - Low density - Very unreactive Disadvantages: - Non-renewable - Persists in the environment (non-biodegradable)
Naming polymers
• Poly(alkene name) • E.g. Poly(Ethene)
Condensation polymerisation
• Requires 2 different functional groups • Each monomer must have 2 functional groups • Each bond produces a small molecule • n a_monomer_a + n b_monomer_b -> n polymer + n-1 small molecule (e.g. water) • n a_monomer_b -> n polymer + n-1 small molecule (e.g. water)
Biopolyester
• Biodegradable polyester
Polymer disposal problems
Burying: - Polymers remains indefinitely since not biodegradable Burning: - Greenhouse / Toxic gases released since polymers are being burn