Aromatic Polyether and Ether-Containing Networks

Trifunctional branched networks will require the removal of additional halogen from the system, a fact that was not observed in any of the element analyses performed on the polymeric products [473-475]. 

Nonetheless, aromatic polyether networks are achievable using synthetic methods currently employed in the preparation of linear polyethers. Thus, one may use, for example, a mixture of the two monomers 

Poly(ether ketones) may be prepared by three additional polycondensation methods. The first and oldest is a Friedel-Crafts polycondensation in which monomers such as diphenyl ether and 1, 3, 5-benzenetricarboxylic acid chloride are reacted together to form an aromatic poly(ether ketone) network  

In the preparation of the linear analogues, solvents such as nitrobenzene [478] and methylene chloride [479] were used. A new method capable of creating poly(ether ketone) and polyfthioether ketone) was recently disclosed by Ueda et al. [480-482]. Here, the dehydrating power of a mixture of phosphorus pentoxide and methanesulfonic acid (MSA) is the driving force for the direct polycondensation of aromatic dicarboxylic acids with aryl compounds contain- 

It is obvious that this reaction easily lends itself to higher functionality aromatic species and, therefore, to the creation of aromatic poly(ether ketone) and poly(thioether ketone) networks. Amorphous poly(ether ketones) were recently prepared [483-485] by the complex reaction of the abstraction of fluorine atoms from aromatic kernels and their partial substitution by oxygen using the reaction of potassium carbonate with fluorine-containing monomers  

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