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| Section3 = }} Poly(dichlorophosphazene), also called dichlorophosphazine polymer or phosphonitrilechloride polymer, is a chemical compound with formula (PNCl2)''n''. It is an inorganic (hence carbon-free) polymer, whose backbone is a chain of alternating phosphorus and nitrogen atoms, connected by alternating single and double covalent bonds. The compound can be prepared by polymerization of hexachlorophosphazene ((PNCl2)3) by heating to ca. 250 °C.〔Hans Rytger Kricheldorf (1991), ''Handbook of Polymer Synthesis〕〔Mario Gleria, Roger De Jaeger (2004) ''Phosphazenes: A Worldwide Insight''Nova Publishers, 2004. 1047 pages. ISBN 1-59033-423-X, 9781590334232〕 It is an "inorganic rubber" and the starting material for many other polymers with the -P=N- backbone (polyphosphazenes), which have important commercial uses. ==History== Poly(dichlorophosphazene) was discovered by H. N. Stokes in the 19th century, and at that time its superior properties over natural rubber were already noted.〔〔H. N. Stokes (1895), (''On the chloronitrides of phosphorus'' ). American Chemical Journal, vol. 17, p. 275.〕〔H. N. Stokes (1896), (''On Trimetaphosphimic acid and its decomposition-products.'' ) American Chemical Journal, vol. 18 issue 8, p. 629. (The name "phosphimic" is used consistently in the title text. The work was done while the author was at the United States Geological Survey.)〕 In 1965, Harry R. Allcock at Pennsylvania State University synthesized a soluble form of the polymer, which opened the doors to the development of many derivatives.〔Mark, J. E.; Allcock, H. R.; West, R. “Inorganic Polymers” Prentice Hall, Englewood, NJ: 1992. ISBN 0-13-465881-7.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Poly(dichlorophosphazene)」の詳細全文を読む スポンサード リンク
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