Hybrid phosphazene-organosilicon polymers: I. Background, rationale, and small-molecule model compound chemistry

Allcock, Harry R.; Kuharcik, Susan E.

doi:10.1007/bf01193059

Cited by 17 publications

(3 citation statements)

References 74 publications

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“…According to the principle, now generally accepted in phosphazene research, that cyclophosphazenes are excellent low-molecular-weight model compounds for the corresponding high polymers, 9,75 we started our research in the field of sol-gel hybrid materials containing phosphazene substrates by first investigating cyclophosphazene derivatives, only later expanding our study to phosphazene macromolecular systems.…”

Section: Poly[bis(4-mentioning

confidence: 99%

Poly(organophosphazene)s and the sol-gel technique

Guglielmi

Brusatin

Facchin

et al. 1999

Appl. Organometal. Chem.

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We report a survey of the utilization of phosphazene materials in combination with metal alkoxide precursors to form ceramics through the sol–gel technique. Silicon, titanium, zirconium and aluminum three‐dimensional oxide networks were exploited for these investigations, while variably functionalized poly[bis(2,2,2‐trifluoroethoxy)phosphazene], poly[bis(methoxyethoxyethoxy)phosphazene] and poly[bis(4‐hydroxyphenoxy)phosphazene] were used as phosphazene substrates. The resulting new hybrid materials, characterized by SEM, EDAX, DTA, TGA, DSC, DMTA and impedance techniques, showed improved thermal and mechanical stability, and higher ionic conductivity when doped with Li+ or Ag+ triflates, than those ob‐served for the corresponding original polyphos‐phazenes. Copyright © 1999 John Wiley & Sons, Ltd.

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Section: Poly[bis(4-mentioning

confidence: 99%

Poly(organophosphazene)s and the sol-gel technique

Guglielmi

Brusatin

Facchin

et al. 1999

Appl. Organometal. Chem.

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“…The uses of such polymers in membranes and in hydrophobic surfaces are subjects of additional interest. Several research groups have explored the possibility that hybrid systems of this type may be accessible. − However, until recently, relatively few successful macromolecular syntheses have been described. − …”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11][12][13][14][15] However, until recently, relatively few successful macromolecular syntheses have been described. [16][17][18][19][20][21][22][23][24] An approach being followed in our program is to link organosilicon side groups to a high polymeric phosphazene chain. One method for the attachment of organosiloxane units to a polyphosphazene is by nucleophilic replacement of the chlorine atoms in poly(dichlorophosphazene) with the use of amine-functionalized organosilicon reagents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Aminoorganosiloxane-Bearing Polyphosphazenes: New Properties by the Elimination of Hydrogen Bonding

1996

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The synthesis of new hybrid polyphosphazene−siloxane polymers is described. These polymers contain a polyphosphazene backbone and [(N-methylamino)propyl]siloxane side groups, −N(Me)(CH2)3SiMe2OSiMe3 or −N(Me)(CH2)3SiMe2OSiMe2OSiMe3, in ratios of 1:1 and 1:3 with trifluoroethoxy, 2-(2-methoxyethoxy)ethoxy, or p-methylphenoxy cosubstituents. The synthetic method utilized allows the polymer properties to be tuned by variations in the cosubstituent ratios. The polymers were characterized by 31P, 13C, and 1H NMR, differential scanning calorimetry (DSC), gel permeation chromatography (GPC), and elemental analysis. The percent loading of siloxane-containing side groups and the nature of the cosubstituents were correlated to the glass transition temperatures. The glass transition temperatures ranged from −83 to −22 °C. The longer, trisiloxane-containing units generated lower glass transition temperatures than did the analogous polymers with disiloxane-containing side groups. Several polymers were further characterized by dynamic mechanical analysis (DMA). In addition to glass transition temperatures, other transitions attributed to the siloxane side groups were detected at approximately −124 °C.

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Polyphosphazenes

Allcock¹

2005

Encyclopedia of Inorganic Chemistry

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Polyphosphazenes comprise the largest class of inorganic polymers. During the past 10 years, new synthetic developments have arisen that allow carefully tailored macromolecules to be assembled with precise chain lengths and with access to star geometries and a range of hybrid phosphazene‐organic polymer systems. This has stimulated research in the use of polyphosphazenes in biomedicine, optoelectronics (photonics), lithium battery technology, and fuel cell membranes, as well as in new elastomers and hydrogels.

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Hybrid phosphazene-organosilicon polymers: I. Background, rationale, and small-molecule model compound chemistry

Cited by 17 publications

References 74 publications

Poly(organophosphazene)s and the sol-gel technique

Poly(organophosphazene)s and the sol-gel technique

Synthesis and Characterization of Aminoorganosiloxane-Bearing Polyphosphazenes: New Properties by the Elimination of Hydrogen Bonding

Polyphosphazenes

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