13.5 Polymerisation in Alkenes
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What is a polymer?
large molecule formed from thousands of REPEAT UNITS of SMALLER molecules called MONOMERS.
What is addition polymerisation?
formation of long MOLECULAR CHAIN from REPEATED ADDITION REACTIONS of UNSATURATED ALKENE MONOMERS
What is a monomer?
SMALL MOLECULE which JOINS with other monomers to form a POLYMER.
What is the difference between a monomer and a polymer repeat unit.
monomer = the alkene molecule which joins with other alkenes to form polymer. polymer repeat unit = section of polymer showing single monomer as it would look bonded to other monomers.
Under what conditions is ethene turned into polyethene?
high temperature + high pressure
How are waste polymers processed for sustainability?
PVC RECYCLING - if burnt, PVC releases HCl + toxins COMBUSTION - burned to generate electricity FEEDSTOCK - reclaim monomers
What are bioplastics?
polymers made from PLANT PRODUCTS. conserves oil.
What are the different types of bioplastics?
BIODEGRADABLE polymers - - broken down by microorganisms PHOTODEGRADABLE polymers - - broken down by light - light weakens bonds, contains light-absorbing additives.
What is the monomer of polyethene?
ethene
What is the monomer of PVC? (polyvinyl chloride)
chloro-ethene