Poly arylene ether -Type Polymers

In cases where carbonyl or sulfonyl groups are inserted between the aromatic rings in addition to oxygen or sulfur, the resulting type of polymers is commonly classified as poly(arylene ether)s (II). 

Polyarylenes, in particular different types of poly(arylene ether ketone)s, have been the focus of much hydrocarbon membrane research in recent years. - - With good chemical and mechanical stability under PEM fuel cell operating conditions, the wholly aromatic polymers are considered to be the most promising candidates for high-performance PEM fuel cell applications. Many different types of these polymers are readily available and with good process capability. Some of these membranes are commercially available, such as poly(arylene sulfone)s and poly(arylene... 

Besides the covalent crosslinking, Kerres et al. investigated the properties of fuel cell membranes of ionicaUy crosslinked polysulfonic adds. This type of crosslinking was achieved by blending sulfonated poly(arylene ether sul-fone)s and poly(arylene ether ketone)s with basic polymers, such as polybenzimidazole, poly(ethylene imine), poly(vinyl pyridine), or amino functional-... 

Zhang, Y., Wan, Y., Zhao, C.J., Shao, K Zhang, G., Li, H.T., Lin, H.D., Na, H., Novel side-chain-type sulfonated poly(arylene ether ketone) with pendant sulfoaUcyl groups for direct methanol fuel cells. Polymer, 2009, 50,4471-4478. 

To make available electrophosphorescent polymers, fluorinated poly(arylene ether phosphine oxide)-type macromolecules were synthesized (Scheme 64). °... 

In this text, we prefer the term arylene ether over aryl ether, in the sense that the aryl group is situated in the backbone of the polymer for example, recall the meaning of the term methylene. There are variants of this t) e of polymer, for example, poly(ether ketone sulfone)s, or poly(ether ether ketone sulfone)s. Basically, a poly(ether ketone sulfone) can be understood as a copol5mier bearing both the poly(ether ketone) moiety, and the poly(ether ketone) moiety in the backbone. This type of polymer could be dealt with either in the poly(ether ketone) chapter or in this chapter it is a matter of taste that we include this type here. Still other variants are summarized in Table 7.1. 

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