Showing papers by "Harry R. Allcock published in 1979"
84 citations
TL;DR: In this paper, a new method for the synthesis of cyclophosphazenes that contain alkyl and hydrido side groups was proposed, which can be used to synthesize a new class of high polymeric organophazenes.
Abstract: : A new method is reported for the synthesis of cyclophosphazenes that contain alkyl and hydrido side groups. These syntheses are model reactions for the synthesis of a new class of high polymeric organophosphazenes. (Author)
36 citations
35 citations
TL;DR: In this paper, a new series of polymers was prepared when 10% of the chlorine atoms were replaced by phenyl groups and the remaining halogen in then replaced by trifluoroethoxy or butyl -amino groups.
Abstract: : The reactions between polydichlorophosphazene, (npcl2)n, leads to both halogen substitution and chain cleavage. A new series of polymers was prepared when 10% of the chlorine atoms were replaced by phenyl groups and the remaining halogen in then replaced by trifluoroethoxy or butyl -amino groups. (Author)
29 citations
28 citations
TL;DR: The first successful metal-halogen exchange reaction between n-butyllithium and a hexa(phalogenophenoxy)cyclotriphosphazene was described in this paper.
Abstract: : The first example of a successful metal-halogen exchange reaction between n-butyllithium and a hexa(p-halogenophenoxy)cyclotriphosphazene is described. The hexalithio derivative was allowed to react with electrophiles to yield carboxylic acid, stannane, and phosphine-derivatives. (Author)
25 citations
22 citations
TL;DR: In this article, the first preparation of soluble poly(difluorophosphazene) was described, together with its reactions with alkoxides, aryloxide, and amines.
Abstract: : The first preparation of soluble poly(difluorophosphazene) is described, together with its reactions with alkoxides, aryloxide, and amines. Amines replace only one fluorine per phosphorus. Mechanistic explanations are suggested on the basis of model compound reactions with cyclic phosphazenes. (Author)
20 citations
19 citations
15 citations
Patent•
27 Jul 1979TL;DR: In this article, the authors present a method of preparation for poly(organophosphazenes) with chromphoric substituents and use it to add color to polyphosphazene polymers to produce food colorants, colored films, colored fibers and similar products.
Abstract: Poly(organophosphazenes) with chromphoric substituents and method of preparation. Products are useful to add color to polyphosphazene polymers to produce food colorants, colored films, colored fibers and similar products.
01 Jan 1979
TL;DR: The discovery and development of a new polymer system is nearly always a stimulating event in macromolecular science and opens up novel avenues for fundamental studies, yields additional opportunities to test established or developing theories and, at the same time, provides unusual materials for technology as mentioned in this paper.
Abstract: The discovery and development of a new polymer system is nearly always a stimulating event in macromolecular science. It opens up novel avenues for fundamental studies, yields additional opportunities to test established or developing theories and, at the same time, provides unusual materials for technology.
TL;DR: In this article, it was shown that Amines replace only one fluorine per phosphorus because of the poor leaving-group ability of fluorine and the low nucleophilicity of the amines.
Abstract: : Fluorocyclophosphazenes are different from chlorocyclophosphazenes in their reactions with primary or secondary amines. Amines replace only one fluorine per phosphorus because of the poor leaving-group ability of fluorine and the low nucleophilicity of the amines. (Author)
TL;DR: In this article, a new alkylhalogenocyclophosphazenes, including those with unsaturated alkyls groups, have been prepared by the interaction of hexachlorocyclotriphosphazene with Grignard reagents and [Bun3PCuI]4.
Abstract: New alkylhalogenocyclophosphazenes, including those with unsaturated alkyl groups, have been prepared by the interaction of hexachlorocyclotriphosphazene with Grignard reagents and [Bun3PCuI]4, followed by treatment with alkyl halides.
Patent•
21 May 1979TL;DR: In this paper, a poly(organophosphazenes) containing one alkyl group per each three repeating units are prepared by thermally polymerizing the monoalkyl-pentachloro-cyclotriphosphazene and then reacting the resultant linear polymer with a suitable alkali metal alkoxide or aryloxide.
Abstract: Poly(organophosphazenes) containing one alkyl group per each three repeating units are prepared. These polymers are represented by the structure: ##STR1## wherein R is alkyl containing from 1 to 10 carbon atoms; wherein X is selected from the group consisting of chlorine and --OR' radicals in which R' is the same as R or is selected from the group consisting of substituted alkyl radicals and substituted or unsubstituted aryl radicals and wherein n is from 3 to 15,000. Polymers of the above structure in which X is chlorine are prepared by thermally polymerizing a monoalkyl-pentachloro-cyclotriphosphazene having the formula N3 P3 Cl5 R in which R is as defined above. Polymers of the above structure in which X is an --OR' radical as defined above are prepared by thermally polymerizing the monoalkyl-pentachloro-cyclotriphosphazene and then reacting the resultant linear polymer with a suitable alkali metal alkoxide or aryloxide.
19 Jan 1979
TL;DR: In this article, it was shown that Amines replace only one fluorine per phosphorus because of the poor leaving-group ability of fluorine and the low nucleophilicity of the amines.
Abstract: : Fluorocyclophosphazenes are different from chlorocyclophosphazenes in their reactions with primary or secondary amines. Amines replace only one fluorine per phosphorus because of the poor leaving-group ability of fluorine and the low nucleophilicity of the amines. (Author)