There are two main kinds of polymers.

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There are two main kinds of polymers.
Type 1 Addition Polymers Each small molecule
adds to the end of a growing chain.
Polyethylene is an example
Type 2 Condensation Polymers Monomer units
come together with the elimination of some small
molecule (often water). Polyesters and nylons are
examples
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Condensation Polymers Also called Step-Growth
Polymers Their synthesis does not involve a
chain reaction.
Instead any two molecules can react at any time.
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Instead any two molecules can react at any time.
Each end of the molecule reacts in turn forming
dimers, trimers etc.
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Nylons - Polyamides
Nylon 6 A polyamide
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Nylon 66
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In the lab
Nylon 6-10
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Supramolecular Structure is Important
Hydrogen bonds hold the nylon chains together
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Kevlar - Helmets - Bullet Proof Vests
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Nylon 2 - the simplest protein
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There are 20 principle amino acids
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Protein - 20 different R groups
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Polyesters
Dacron
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Cross linked
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Starch
a-glucose
Polyether
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DNA
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DNA