7
Question
Identify from the above monomers which undergo condensation polymerization.
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Solution
The correct option is D 2, 4
3 and 5 are addition polymers:
Addition polymers form:
- When unsaturated carbon (organic) molecules react to form a long chain polymer molecule
- No small molecules or atoms are eliminated during the reaction chloroethene (vinyl chloride) CH2=CHCl monomer forms polymer polyvinyl chloride (PVC) −[−CH2−CHCl−]n− (Tetrafluoroethene (tetrafluoroethylene))
CF2=CF2 monomer forms polymer polytetrafluorethene (polytetrafluoroethylene, teflon) −[CF2−CF2−]n−
Condensation polymers form:
When bifunctional monomers react to form a long chain polymer molecule small molecules, such as water, are eliminated during the reaction. Polyesters, polyamides, proteins and polysaccharides such as cellulose, are all examples of condensation polymers.
Example:
terephthalic acid + ethylene glycol gives polyethylene terephthalate (PET, PETE, or terylene or dacron)
nHOOC−C6H4−COOH+nHO−(CH2)2−OH→
−(−OCC6H4−COO−(CH2)2−O−)n−+(2n−1)H2O
3 and 5 are addition polymers:
Addition polymers form:
- When unsaturated carbon (organic) molecules react to form a long chain polymer molecule
- No small molecules or atoms are eliminated during the reaction chloroethene (vinyl chloride) CH2=CHCl monomer forms polymer polyvinyl chloride (PVC) −[−CH2−CHCl−]n− (Tetrafluoroethene (tetrafluoroethylene))
Condensation polymers form:
When bifunctional monomers react to form a long chain polymer molecule small molecules, such as water, are eliminated during the reaction. Polyesters, polyamides, proteins and polysaccharides such as cellulose, are all examples of condensation polymers.
Example:
terephthalic acid + ethylene glycol gives polyethylene terephthalate (PET, PETE, or terylene or dacron)
nHOOC−C6H4−COOH+nHO−(CH2)2−OH→
−(−OCC6H4−COO−(CH2)2−O−)n−+(2n−1)H2O
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