Dacron linked monomers

As an example of a polyester fiber, consider the condensation polymer Dacron (also sold as a film—Mylar). The monomeric repeating unit of Dacron is shown in Fig. 7.8.2, with several linked monomers indicated in Fig. 7.8.3. While the... 

Figure 7.8.3 Several linked monomers of the polymer Dacron.

In condensation polymers, the monomers are linked together by condensation reactions, like those used to form ester or amide links. Polymers formed by linking together monomers that have carboxylic acid groups with those that have alcohol groups are called polyesters. Polymers of this type are widely used to make artificial fibers. A typical polyester is Dacron, or Terylene, a polymer produced from the... 

If each monomer molecule contains just two functional groups, growth can occur in only two directions, and a linear polymer is obtained, as in nylon 66 or Dacron. But if reaction can occur at more than two positions in a monomer, there is formed a highly cross-linked space network polymer, as in Glyptal, an alkyd resin. Dacron and Glyptal are both polyesters, but their structures are quite different and, as we shall see, so are their uses. 

Synthetic pol3mers play important roles in our daily hves. Polymers are compounds that are made by linking together many small molecules called monomers. The monomers of many synthetic polymers are held together by ester and amide bonds. For example. Dacron is a polyester and nylon is a polyamide. 

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