1 chapter 11 unsaturated hydrocarbons 11.4 polymers of alkenes
Post on 22-Dec-2015
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Chapter 11 Unsaturated Hydrocarbons
11.4 Polymers of Alkenes
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Polymers
Polymers are
• large, long-chain molecules.
• found in nature, including cellulose in plants, starches in food, proteins, and DNA in the body.
• also synthetic such as polyethylene and polystyrene, Teflon, and nylon.
• have small repeating units called monomers.• can be made from reaction of small alkenes.
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Common Synthetic Polymers
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Common Synthetic Polymers
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Common Synthetic Polymers
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Polymerization
In polymerization, small repeating units called monomers join to form a long chain polymer.
monomer unit repeats
n
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Polymers from Addition Reactions
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More Monomers and Polymers
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Learning Check
What is the starting monomer for polyethylene?
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Solution
Ethene (ethylene)
CH2=CH2
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Learning Check
Name the monomer used to make Teflon and write a
portion of a Teflon polymer using four monomers.
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Solution
F F │ │
F─C=C─F tetrafluoroethene
F F F F F F F F │ │ │ │ │ │ │ │
─C─C─C─C─C─C─C─C─ portion of Teflon │ │ │ │ │ │ │ │
F F F F F F F F
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Recycling Plastics
Recycling is simplified by using codes on plastic items.
1 PETE Polyethyleneterephtalate
2 HDPE High-density polyethylene
3 PV Polyvinyl chloride
4 LDPE Low-density polyethylene
5 PP Polypropylene
6 PS Polystyrene
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Learning Check
What types of plastic are indicated by the following
codes?
A.
B.
C.
3PV
5PP
6PS
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Solution
What types of plastic are indicated by the following
codes?
A. Polyvinyl chloride
B. Polypropylene
C. Polystyrene
.
3PV
5PP
6PS