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Polyphosphazene
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<p>Polyphosphazenes include a wide range of hybrid <a href="/facts/Inorganic_chemistry/ErD6ypnb">inorganic</a>-<a href="/facts/Organic_chemistry/djxhxaNg">organic</a> <a href="/facts/Polymer/eF32E50K">polymers</a> with a number of different <a href="/facts/Polymer_architecture/DzNCeSoo">skeletal architectures</a> with the backbone <a href="/facts/Phosphorus/27xCeIqs">P</a>-<a href="/facts/Nitrogen/Nf1QpGDz">N</a>-P-N-P-N-. In nearly all of these materials two organic side groups are attached to each <a href="/facts/Phosphorus/27xCeIqs">phosphorus</a> center. Linear polymers have the formula (N=PR1R2)n, where R1 and R2 are organic (see graphic). Other architectures are cyclolinear and cyclomatrix polymers in which small <a href="/facts/Phosphazene/IR0jFetb">phosphazene rings</a> are connected together by organic chain units. Other architectures are available, such as <a href="/facts/Block_copolymer/35D97DuV">block copolymer</a>, <a href="/facts/Polymer_architecture/DzNCeSoo">star</a>, <a href="/facts/Dendritic_polymer/2b4uoKo9">dendritic</a>, or <a href="/facts/Polymer_architecture/DzNCeSoo">comb-type</a> structures. More than 700 different polyphosphazenes are known, with different side groups (R) and different molecular architectures. Many of these polymers were first synthesized and studied in the research group of <a href="/facts/Harry_R._Allcock/G6vDbEGM">Harry R. Allcock</a>. </p>