Ultraviolet radiation-induced crosslinking of poly[bis(2-(2-methoxyethoxy)ethoxy)phosphazene]

Nelson, Constance J.; Coggio, William D.; Allcock, Harry R.

doi:10.1021/cm00017a010

Cited by 38 publications

(36 citation statements)

References 2 publications

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“…At ambient temperature, in fact, MEEP is in the visco-elastic flow regime, 22,25 and can therefore flow like a viscous liquid without retaining its form when subjected to an external force. For these reasons the mechanical properties of MEEP need to be improved in order to facilitate its practical utilization; this aim was achieved in the past by chemical, 58 photochemical 59 or g-radiolytic 49,60 reticulation of the polymer, and by blending it with crystalline poly(ethylene oxide). 61,62 However, a novel route was recently proposed to improve the mechanical properties of MEEP, based on the preparation of composite materials showing controlled morphology and physical properties.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

Poly(organophosphazene)s and the sol-gel technique

Guglielmi

Brusatin

Facchin

et al. 1999

Appl. Organometal. Chem.

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“…Ultraviolet-induced crosslinking has been demonstrated for polyphosphazenes with -OCH2CH2OCH2CH2OCH3 side groups (with and without photosensitizers) (38) (14) is important both for the formation of hydrogels and for the dimensional stabilization of solid electrolytes (see later). Cinnamate and chalcone-based crosslinking reactions were developed for the stabilization of NLO activity, but are also potentially useful in photolithography.…”

Section: Side Groups For Different Crosslinking Processesmentioning

confidence: 99%

“…The exposure of films of MEEP to 2200 -4000 A ultraviolet radiation results in crosslinking (38). The reaction takes place readily in the presence of photosensitizers such as benzophenone, but also occurs in the absence of added photosensitizers.…”

Section: Solid Polymeric Electrolytes Based On Crosslinked Meep-type mentioning

confidence: 99%

Macromolecular and Materials Design Using Polyphosphazenes

Allcock

1994

ACS Symposium Series

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A 279 781 .ENTAT0704N0188I ~ ~ut qf q~c fl~ D~Cu~m q tle IMO tOE r.. nq -flhtfli cisoet s Saeeci nq *%.Sungq eatsa vn LA7 a ma *qtte tro COII."IIOA ou tnst iO .ree, iM W aralq but* oM tm ate OC 4ft Ottwsl a 0oe l o s tp4.% ou'et onto vv41n*qton meoooo-Aat-r $4"voee, otrectorate for infformatiOqN O{4WI49M•AeI, •t$ 1&04 "00"sl~r "te cfficeIt mf anaqqm" t aa s get. 0 -100twOtt Retf tn Pr la`tt (0 ?04. Reproduction in whole or in part is permitted for any purpose of the United States Government. This document has been approved for public release; distribution is unlimited. ABSTRACT (Maximum 200 words)Polyphosphazenes are among the most versatile of all polymers. This is a consequence of the unique properties of the phosphorus-nitrogen backbone and the ease with which a wide range of different side groups can be introduced mainly by macromolecular substitution, but also by the polymerization of different "monomers". This field has reached a stage where the fundamental chemistry now allows the design and synthesis of a broad range of new materials that are valuable for properties such as elasticity, high refractive index, liquid crystallinity, ferroelectric-, NLO-, and photochromic attributes, and for uses as solid ionic conductors, biomedical microencapsulation polymers, and materials with controlled surface properties. Polyphosphazenes are among the most versatile of all polymers. This is a consequence of the unique properties of the phosphorus-nitrogen backbone and the ease with which a wide range of different side groups can be introduced mainly by macromolecular substitution, but also by the polymerization of different "monomers". This field has reached a stage where the fundamental chemistry now allows the design and synthesis of a broad range of new materials that are valuable for properties such as elasticity, high refractive index, liquid crystallinity, ferroelectric-, NLO-, and photochromic attributes, and for uses as solid ionic conductors, biomedical microencapsulation polymers, and materials with controlled surface properties. Inorganic-Organic Polymers as Components of New MaterialsMaterials science covers a very broad range of substances within the four main classical categories of ceramics, metals, semiconductors/electro-optical solids, and petrochemical polymers.Most of the examples in the first three categories are inorganic ip composition, while the last is mainly organic.All four have advantages and disadvanges. For example, the totally inorganic materials are heavy, often britttle, and difficult to fabricate. On the other hand, conventional polymers are tough and easy to fabricate but are unstable at elevated temperatures and lack many of the interesting electrical and optical properties of the inorganic materials.The main concept behind the current interest in inorganic or inorganic-organic polymers is that they may provide a means for the preparation of new materials that combine the advantages and minimize the disadvantages of the classical materials. Thus, the long term interest lies in the d...

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“…With respect to a synthetic point of view, polyphosphazenes (Scheme 1) are particularly versatile among the inorganic polymers studied for polymer electrolyte application. In the meantime, poly[bis(methoxyethoxyethoxy)-phosphazene] (MEEP) which was first synthesized and [5][6][7][8]. MEEP is a gellike polymer matrix with a considerable flexibility of the phosphazene backbone leading to a completely amorphous system.…”

Section: Introductionmentioning

confidence: 99%