Conformational Analysis of Poly(alkoxy-and aryloxyphosphazenes)

Robert W. Allen; Harry R. Allcock

doi:10.1021/ma60054a015

Conformational Analysis of Poly(alkoxy-and aryloxyphosphazenes)

Robert W. Allen, Harry R. Allcock

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

The poly(organophosphazenes), [NP(OCH₃)₂]_n, [NP(OCH₂CH₃)₂]_n, [NP(OCH₂CF₃)₂]_n, and [NP(OC₆H₅)₂]_n, have been studied by conformational analysis techniques with the use of intramolecular nonbonding 6:12 Lennard-Jones and Coulombic potentials. The energy surfaces reveal broad areas of low potential for the methoxy, ethoxy, and trifluoroethoxy derivatives that are consistent with the very low glass transition temperatures and a high chain mobility. Backbone torsional motions appear to be more restricted for the phenoxy derivative and this is compatible with a higher T_g value. Low potential energy wells are found at points which correspond to the approximately cis-trans conformation inferred from x-ray diffraction data from [NP(OCH₂CF₃)₂]_n and [NP(OC₆H₅)₂]_n.

Original language	English (US)
Pages (from-to)	956-960
Number of pages	5
Journal	Macromolecules
Volume	9
Issue number	6
DOIs	https://doi.org/10.1021/ma60054a015
State	Published - Nov 1 1976

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Conformational Analysis of Poly(alkoxy-and aryloxyphosphazenes)",

abstract = "The poly(organophosphazenes), [NP(OCH3)2]n, [NP(OCH2CH3)2]n, [NP(OCH2CF3)2]n, and [NP(OC6H5)2]n, have been studied by conformational analysis techniques with the use of intramolecular nonbonding 6:12 Lennard-Jones and Coulombic potentials. The energy surfaces reveal broad areas of low potential for the methoxy, ethoxy, and trifluoroethoxy derivatives that are consistent with the very low glass transition temperatures and a high chain mobility. Backbone torsional motions appear to be more restricted for the phenoxy derivative and this is compatible with a higher Tg value. Low potential energy wells are found at points which correspond to the approximately cis-trans conformation inferred from x-ray diffraction data from [NP(OCH2CF3)2]n and [NP(OC6H5)2]n.",

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T1 - Conformational Analysis of Poly(alkoxy-and aryloxyphosphazenes)

AU - Allen, Robert W.

AU - Allcock, Harry R.

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N2 - The poly(organophosphazenes), [NP(OCH3)2]n, [NP(OCH2CH3)2]n, [NP(OCH2CF3)2]n, and [NP(OC6H5)2]n, have been studied by conformational analysis techniques with the use of intramolecular nonbonding 6:12 Lennard-Jones and Coulombic potentials. The energy surfaces reveal broad areas of low potential for the methoxy, ethoxy, and trifluoroethoxy derivatives that are consistent with the very low glass transition temperatures and a high chain mobility. Backbone torsional motions appear to be more restricted for the phenoxy derivative and this is compatible with a higher Tg value. Low potential energy wells are found at points which correspond to the approximately cis-trans conformation inferred from x-ray diffraction data from [NP(OCH2CF3)2]n and [NP(OC6H5)2]n.

AB - The poly(organophosphazenes), [NP(OCH3)2]n, [NP(OCH2CH3)2]n, [NP(OCH2CF3)2]n, and [NP(OC6H5)2]n, have been studied by conformational analysis techniques with the use of intramolecular nonbonding 6:12 Lennard-Jones and Coulombic potentials. The energy surfaces reveal broad areas of low potential for the methoxy, ethoxy, and trifluoroethoxy derivatives that are consistent with the very low glass transition temperatures and a high chain mobility. Backbone torsional motions appear to be more restricted for the phenoxy derivative and this is compatible with a higher Tg value. Low potential energy wells are found at points which correspond to the approximately cis-trans conformation inferred from x-ray diffraction data from [NP(OCH2CF3)2]n and [NP(OC6H5)2]n.

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Conformational Analysis of Poly(alkoxy-and aryloxyphosphazenes)

Abstract

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