Repeating Units of Synthetic Fibers

The physical stmcture and properties of synthetic fibers are largely determined by the repeating units. Polymers with all kinds of repeating units have been developed for different applications. However, only a few of these polymers have been made into synthetic fibers. This is because to make useful fibers, the polymers have to meet certain stmctnre reqnirements, which will be discussed later. Table 2.2 shows the repeating units for some important polymers that can be made into synthetic fibers. 

Case 1 Monomer = Monomeric Unit = Repeating Unit 

Case 3 Monomer Monomeric Unit Repeating Unit 

Aramids Polyparaphenylene terephthalamide (Kevlar ) Polymetaphenylene isophthalamide (Normax ) 0 0 0 0 

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