Poly imide condensation type

In 1951, Flory reported the condensation reaction of diacid chlorides, e.g. with potassium salts of imides, e.g. the condensation of sebacyl chloride with potassium phthalimide. In this way, A -acyl diimides are formed. Flory pointed out the possibility of forming polymers, when components with higher functionality are used. Poly(imide)s (PI)s from pyromeUitic acid were reported in 1955 by Edwards and Maxwell at DuPont. Tbe diamines used were of aliphatic nature. Later, in addition, aromatic diamines were used. The two major types of Pis are ... 

These poly(amide-imide) materials were extensively studied in the 1980s in various aspects (e.g. synthesis and preparation of blends with other polymeric materials), [2, 88-96] demonstrating the increasing interest in these materials. More recently, water soluble polyamides and poly(amide-imide)s [97] as well as polyhydroxyimides [98] structurally analogous to those described in Fig. 4.18 have been reported. Additionally, photoactive polymers were prepared by the condensation of a maleopimaric adduct with azo-dye type diamines [99]. The levopimaric... 

Poly(ethylene imide), a condensation product of epichlorohydrin and dimethylamine, is a representative polymer in this class whose chemical structure is shown in Fig. 5. It is extremely difficult to obtain molecular weights similar to those of the polymers shown in Section 3.2.1. Ordinarily, the molecular weights of these types of polymers are several tens of thousands to several hundreds of thousands. 

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