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Harry R. Allcock coauthored Phosphonitrilic Compounds. VI. High Molecular Weight Poly(alkoxy- and aryloxyphosphazenes) by Harry R. Allcock and others.

Polyphosphazenes have a backbone of alternating phosphorus and nitrogen atoms with substituents attached to phosphorus. Changing those substituents alters properties such as flexibility and chemical resistance without changing the basic backbone, which is central to the poly(alkoxy- and aryloxyphosphazene) materials described in the publication.