EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:4.5.2 Disposal of Addition Polymers

EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:4.5.2 Disposal of Addition Polymers

Disposal of Addition Polymers

 

  • Addition polymers are formed by the joining up of many small molecules with strong C-C bonds
  • This makes addition polymers unreactive and chemically inert so don’t easily biodegrade

 

 

Disposal-of-polymers

 

Disposal of addition polymers is an environmental problem

 

 

 

Landfills

  • Waste polymers are disposed off in landfill sites but this takes up valuable land, as addition polymers are non-biodegradable so micro-organisms such as decomposers cannot break them down
  • This causes sites to quickly fill up

 

Incineration

  • Polymers release a lot of heat energy when they burn and produces carbon dioxide which is a greenhouse gas that contributes to climate change
  • Polymers that contain chlorine such as PVC release toxic hydrogen chloride gas when burned
  • If incinerated by incomplete combustion, carbon monoxide will be produced which is a toxic gas that reduces the capacity of the blood to carry oxygen

 

Recycling

  • Polymers can be recycled but different polymers must be separated from each other
  • This process is difficult and expensive

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