ISSN:
0360-6376
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reactions of hexa(aryloxy)cyclotriphosphazenes N3P3(OR)6[R = C6H5, C6H4CH3-p] with polyhaloalkanes in the presence of anhydrous aluminium chloride yield new crosslinked phosphazene polymers which are characterized by elemental analysis, IR spectroscopy, and pyrolysis - mass spectrometric measurements. Soluble “prepolymers” are obtained by using stoichiometric quantities of the phosphazene and haloalkane in nitromethane as the solvent. The 1H and 31P NMR data for these “prepolymers” are presented. The thermal stability of the polymers derived from various haloalkanes decreases in the order 1,2-ClCH2CH2Cl 〈 CHCl3 〉 CH2Cl2 〉 CCl4. The thermal stability also increases with increasing amounts of the catalyst, reaching a maximum at 1:10 mol ratio of N3P3(OPh)6:AlCl3. The phosphazene polymers reported here possess much greater thermal stability compared to linear polyorganophosphazenes, [NPR2]n, as well as the polymers prepared by the Friedel-Crafts reactions of P(O)(OPh)3 and P(O)(OC6H4CH3-p)3 with haloalkanes.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1984.170221131
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