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PA (Polyamide) is a semi-crystalline polymer. There are two types: those made of one basic material (e.g. PA 6) and those made of two basic materials (e.g. PA 66). They can occur both naturally (e.g. wool and silk) and synthetically (e.g. nylon).
Polyimides are step or condensation polymers derived from both aliphatic or. aromatic dianhydrides and diamines, or their derivatives, and contain a heterocyclic imide. linkage in the repeat unit, as shown in Figure 2.1. Figure 2.1 A Heterocyclic Imide Linkage. Polyimides are both scientifically and commercially important due to their excellent. thermal stability and mechanical strength.