A Study of Solution Polymerization of Polyphosphazenes
PITTSBURGH UNIV PA SCHOOL OF ENGINEERING
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Several alkoxyaryloxy substituted phosphazene polymers POR2Nn, where RCH3, C6H5, C6H5CH3, CH,2CF3, C6H4-C6H5, C6H5-CI, C6H5Br, C8H10 were prepared by the reaction of polydichlorophosphazene with their corresponding sodium salts. The polydichlorophosphazene was obtained by the solution polymerization of hexachlorocyclotriphosphazene in 1,2,4-trichlorobenzene. Sulfamic acid and ammonium sulfamate were used as catalysts Apparently sulfamic acid functions as a catalyst through its acid group in some decomposed form. Toluenesulfonic acid and sulfobenozic acid were new calalysts developed for solution polymerization. The polymerization favors a cationic mechanism. Promoters were found to speed up the polymerization reaction and reduce branching. Effect of different parameters including dilution, catalyst concentration and promoter concentration on the properties of the final polymer were investigated.
- Polymer Chemistry