Condensation Polymers
Polyesters:
Polyesters such as PET (polyethylene terephthalate) are condensation polymers. The formation of a polyester follows the same procedure as in the synthesis of a simple ester. The only difference is that both the alcohol and the acid monomer units each have two functional groups - one on each end of the molecule. In this polymer, every other repeating unit is identical.
PET is made from ethylene glycol and terephthalic acid by splitting out water molecules (-H from alcohol and -OH from acid as shown in red on the graphic). The units are joined to make the ester group shown in green.
A simple representation is -[A-B-A-B-A-B]-.
Depending upon the processing a variety of products are possible. If cross linked it is made into clear plastic soft drink bottles. It can also be made into textile fibers known as Dacron and accounts for 50% of all fibers used to make clothing. Blended with cotton, Dacron is made into no-iron clothes.
This same polymer with the trade name of mylar when made as "tape" is magnetically coated for use in tape recorders and videotape machines.
Link to Polyester - with Chime molecule - Macrogalleria at U. Southern Mississippi
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