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Chemistry unit 2

21 Polymerisation

QuestionAnswer
in organic chemistry small molecules can join repeatedly to one another building up into a very large molecule called polymers. these small molecules are rather reactive molecules called monomers
the 2 main types of polymerization processes -addition polymerization -condensation polymerization
polymers can exist either -naturally -synthetic
natural polymers are those that exist in nature and include addition polymers such as rubber and condensation polymers such as proteins and carbohydrates
synthetic polymers are quite common and include addition polymers such as polyethene, poly vinyl chloride and polytetrafluroethene
there are also condensation polymers which are synthetic in origin such as nylon 6.6 and Terylene
diagram type of polymers dd
addition polymers involves the linking together of monomers with double or triple bonds. these unsaturated monomers have bonds which are able to break and link up with other monomers to form a repeating chain
addition polymerization is involved in the manufacture of polymers such as -polyethene, -poly vinyl chloride (PVC) and -polytetrafluroethene (PTFE)
In the polymerization of ethene, many molecules of the monomers add together to form a polymer
the pi bond is broken to form a free radical
free radicals are highly reactive chemical molecules with unpaired electrons. species such as H• and •OH.
the free radicals mechanisms can be divided into 3 stages -the initiation -the propagation -the termination
Created by: 868TOYA
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