Fluorinated Polyphosphazenes

The presence of fluorine in the side group structure has led to some of the most intriguing developments, and this is the focus of this chapter. Using the two-step synthesis protocol, molecular diversity is accomplished in several different ways. One method for structural and property tuning involves the introduction of two or more different side groups along the same polymer chain. Another opportunity for structural diversity arises through organic side group exchange chemistry. Finally, the preparation of polymers with multifunctional organic side groups raises a synthetic challenge. In addition to these methods, mixed side group systems have been synthesized through block copolymers with other polyphosphazenes, or with organic polymers or organosilicon polymers. The chapter discusses the ways in which fluorine plays an important role in the synthesis of polyphosphazenes. It illustrates the properties of fluorinated polyphosphazenes, and concludes with a discussion on the existing and emerging applications for fluorinated polyphosphazenes.