On the Contributions to the Materials Science Aspects of Phosphazene Chemistry by Professor Christopher W. Allen: The One-Pot Synthesis of Linear Polyphosphazenes

Peterson, Eric S.; Luther, Thomas A.; Harrup, Mason K.; Klaehn, John R.; Stone, Mark C.; Orme, Christopher J.; Stewart, Frederick F.

doi:10.1007/s10904-007-9122-7

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…2,6-Dioxa-14,18-diazatricyclo-[18⋅4⋅0⋅0 7,12 ]-tetracosa- 7,9,11,20,22,24(1)-hexaene 1, 2,6-dioxa-14, 19-diazatricyclo-[19⋅4⋅0⋅0 7,12 ]-pentacosa- 7,9,11,21,23,25(1)-hexaene 2 and 2,7-dioxa-15,19-diazatricyclo-[19⋅4⋅0⋅0 8,13 ]-pentacosa-8, 10, 12, 21, 23, 25(1)-hexaene 3 40,41 were prepared according to the cited procedures. Also compound 4 was obtained from the reaction of 1 with N 3 P 3 Cl 6 according to the reported method.…”

Section: Synthesis Of Compoundsmentioning

confidence: 99%

“…[6][7][8][9] The different substituents that are bonded to phosphorus atoms are very effective for the determination of the physical and chemical properties of new phosphazene derivatives and polyorganophosphazenes. [10][11][12] Hence, researchers have focused on the replacement reactions of halogen atoms of halophosphazenes by different nucleophiles, e.g. primary and secondary amines, [13][14][15] diamines, [16][17][18] diphenols, [19][20][21][22] diaza-crown ethers (coronands) [23][24][25][26] and aminophenols.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus-nitrogen compounds: Part 15. Synthesis, anisochronism and the relationship between crystallographic and spectral data of monotopic spiro-crypta phosphazenes

et al. 2008

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The reactions of hexachlorocyclotriphosphazatriene, N 3 P 3 Cl 6 , with N 2 O 2 -donor type coronands,, respectively. The reaction of 4 with excess pyrrolidine leads to the formation of geminal. The 31 P-NMR spectra of 5 and 6 indicate that these compounds have anisochronism. The structures of 5, 6 and 7 were investigated by X-ray crystallography. For 7, the sums of the bond angles around the N atoms were 348⋅6(2)° and 349⋅7(2)° indicating that the N atoms have pyramidal configurations and are stereogenic. The relationship between the chemical shift values δP (spiro) and the Δ(P-N) (electron density transfer parameters) of 4, 5, 6, 7 and the analogous compounds as well as the relationship between the Δ(δP) values and the above mentioned Δ(P-N) are presented respectively. In addition, the relationship between the endocyclic NPN bond angles of these compounds and the 31 P-NMR chemical shifts of the spiro-phosphorus atoms were investigated. The spectroscopic and structural investigations of the compounds were made by elemental analyses, MS, FTIR, one-dimensional 1 H-, 13 C-, 31 P-NMR, DEPT and two-dimensional COSY, HETCOR, HMBC, homo-and heteronuclear correlation techniques.

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Section: Synthesis Of Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phosphorus-nitrogen compounds: Part 15. Synthesis, anisochronism and the relationship between crystallographic and spectral data of monotopic spiro-crypta phosphazenes

et al. 2008

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“…Despite the success of the bulk phase thermal ring opening polymerization in lab scale syntheses, this method is not economically feasible for large-scale production of polyphosphazene materials. Alternative methods, which will not be discussed in this review, including solution phase thermal ring opening [ 28 ], living cationic [ 29 – 32 ], and one-pot De Jaeger [ 33 ] polymerization techniques have been reported.…”

Section: Synthesis Of Polyphosphazenesmentioning

confidence: 99%

Biodegradable Polyphosphazene Biomaterials for Tissue Engineering and Delivery of Therapeutics

Baillargeon

Mequanint

2014

BioMed Research International

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Degradable biomaterials continue to play a major role in tissue engineering and regenerative medicine as well as for delivering therapeutic agents. Although the chemistry of polyphosphazenes has been studied extensively, a systematic review of their applications for a wide range of biomedical applications is lacking. Polyphosphazenes are synthesized through a relatively well-known two-step reaction scheme which involves the substitution of the initial linear precursor with a wide range of nucleophiles. The ease of substitution has led to the development of a broad class of materials that have been studied for numerous biomedical applications including as scaffold materials for tissue engineering and regenerative medicine. The objective of this review is to discuss the suitability of poly(amino acid ester)phosphazene biomaterials in regard to their unique stimuli responsive properties, tunable degradation rates and mechanical properties, as well as in vitro and in vivo biocompatibility. The application of these materials in areas such as tissue engineering and drug delivery is discussed systematically. Lastly, the utility of polyphosphazenes is further extended as they are being employed in blend materials for new applications and as another method of tailoring material properties.

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“…Living cationic polymerization Cl 3 P=NSiMe 3 , controlled M n = Manners, Allcock et al [33,34] ( 1 0 3 -10 6 g/mol), narrow PDI M n -number average molar mass in g/mol (= molar mass); PDI -polydispersity in- [21,26]. A particularly interesting method (last one in Table 1) was reported in 1997 consisting of a cationic living polymerization of phosphazene monomers with PCl 5 as chain growth initiator [27].…”

Section: Synthetic Routementioning

confidence: 99%

Salt-in-Polymer Electrolytes for Lithium Ion Batteries Based on Organo-Functionalized Polyphosphazenes and Polysiloxanes

Burjanadze

Karatas

Kaskhedikar

et al. 2010

Zeitschrift Für Physikalische Chemie

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An overview is given on polymer electrolytes based on organo-functionalized polyphosphazenes and polysiloxanes. Chemical and electrochemical properties are discussed with respect to the synthesis, the choice of side groups and the goal of obtaining membranes and thin films that combine high ionic conductivity and mechanical stability. Electrochemical stability, concentration polarization and the role of transference numbers are discussed with respect to possible applications in lithium batteries. It is shown that the ionic conductivities of salt-in-polymer membranes without additives and plasticizers are limited to maximum conductivities around 10 −4 S/cm. Nevertheless, a straightforward strategy based on additives can increase the conductivities to at least 10 −3 S/cm and maybe further. In this context, the future role of polymers for safe, alternative electrolytes in lithium batteries will benefit from concepts based on polymeric gels, composites and hybrid materials. Presently developed polymer electrolytes with oligoether sidechains are electrochemically stable in the potential range 0-4.5 V (vs. Li/Li + reference).

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On the Contributions to the Materials Science Aspects of Phosphazene Chemistry by Professor Christopher W. Allen: The One-Pot Synthesis of Linear Polyphosphazenes

Cited by 9 publications

References 28 publications

Phosphorus-nitrogen compounds: Part 15. Synthesis, anisochronism and the relationship between crystallographic and spectral data of monotopic spiro-crypta phosphazenes

Phosphorus-nitrogen compounds: Part 15. Synthesis, anisochronism and the relationship between crystallographic and spectral data of monotopic spiro-crypta phosphazenes

Biodegradable Polyphosphazene Biomaterials for Tissue Engineering and Delivery of Therapeutics

Salt-in-Polymer Electrolytes for Lithium Ion Batteries Based on Organo-Functionalized Polyphosphazenes and Polysiloxanes

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