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Poly(dichlorophosphazene)
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<h2 id="history">History</h2> <p>Poly(dichlorophosphazene) was discovered by H. N. Stokes in the 19th century, and at that time its superior properties over <a href="/facts/Natural_rubber/CbsjJxhY">natural rubber</a> were already noted.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a><a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> In 1965, <a href="/facts/Harry_R._Allcock/G6vDbEGM">Harry R. Allcock</a> at <a href="/facts/Pennsylvania_State_University/WMQagtjM">Pennsylvania State University</a> synthesized a soluble form of the polymer, which opened the doors to the development of many derivatives.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p> <h2 id="uses">Uses</h2> <p>Poly(dichlorophosphazene) is not water-resistant. However, it is soluble in organic solvents such as <a href="/facts/THF/P5t6SkMK">THF</a> and <a href="/facts/Benzene/Fguue7nr">benzene</a>, wherein it can be derivatized by replacement of the chlorine atoms with -OR or -NR2 groups (R = <a href="/facts/Alkyl/vmEk8X4v">alkyl</a>, <a href="/facts/Aryl/M3z7QRXd">aryl</a>) to yield many other polyphosphazenes. Some of these organically modified polymers are hydrolytically stable and exhibit some attractive properties such as low glass transition temperatures. </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Hans Rytger Kricheldorf (1991), Handbook of Polymer Synthesis <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Mario Gleria, Roger De Jaeger (2004) Phosphazenes: A Worldwide InsightNova Publishers, 2004. 1047 pages. ISBN 1-59033-423-X, 9781590334232 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Hans Rytger Kricheldorf (1991), Handbook of Polymer Synthesis <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>H. N. Stokes (1895), On the chloronitrides of phosphorus. American Chemical Journal, vol. 17, p. 275. <a href="https://archive.org/stream/americanchemical171895balt#page/275/mode/1up" target="_blank">https://archive.org/stream/americanchemical171895balt#page/275/mode/1up</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>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.) <a href="https://archive.org/stream/americanchemical181896balt#page/629/mode/1up" target="_blank">https://archive.org/stream/americanchemical181896balt#page/629/mode/1up</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Mark, J. E.; Allcock, H. R.; West, R. “Inorganic Polymers” Prentice Hall, Englewood, NJ: 1992. ISBN 0-13-465881-7. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>