4.1.3 polymers mindmap
- Created by: avocado05
- Created on: 25-02-22 14:27
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- polymers
- disposing of polymers
- reducing environmental damage
- develop biodegradable polymers as alternatives
- develop ways of cracking
- use for feedstock recycling
- processing usefully
- separation into types and recycling
- combustion for energy
- used for cracking
- problems disposing polymers
- produces harmful/toxic fumes when burnt
- HCl /toxic dioxins evolved when PVC burnt
- non-biodegradable
- produces harmful/toxic fumes when burnt
- reducing environmental damage
- recycling polymers
- advantages
- confines finite resources
- decreases waste in landfill
- disadvantages
- polymers must be sorted by type
- cannot be used for mixed polymers
- polymers must be sorted by type
- process
- polymer chopped to flakes, washed and melted
- cut into pellets and used to make new products
- advantages
- PVC recycling
- advantages
- involved grinding PVC and reusing
- solvents used to dissolve polymer and PVC recovered by precipitation
- disadvantages
- dumping in landfill unsustainable
- when burnt releases HCL and toxic dioxins
- advantages
- feedstock recycling
- chemical/thermal process that reclaims monomers from waste polymers
- handles unsorted polymers
- products resemble those from crude oil in refineries
- can be used as raw materials
- chemical/thermal process that reclaims monomers from waste polymers
- photodegradable polymers
- contain bonds weakened by absorption of light so degrade
- biodegradable polymers
- microorganisms break them down into H2O, CO2 and biological compounds
- degrade and leave no toxic residue
- usually made from starch/cellulose that alter structure so can be beat down
- microorganisms break them down into H2O, CO2 and biological compounds
- disposing of polymers
- microorganisms break them down into H2O, CO2 and biological compounds
- degrade and leave no toxic residue
- usually made from starch/cellulose that alter structure so can be beat down
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