4. Polyamides

Other features include the use of Arabic numerals to indicate the number of carbon atoms in the unit, always preceded by the PA symbol.

Example

PA 6 corresponds to polycaprolactam $— NH — {({CH}_{2})}_{5} — CO —$

PA 11 stands for polyundecanamide $— NH — {({CH}_{2})}_{10} — CO —$

A more general distinction is made...

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Polyamides