Polyphosphazenes: A Review

Gleria, Mario; Jaeger, Roger De

doi:10.1007/b100985

Cited by 96 publications

(89 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The broad and relatively low intensity peaks in the double-angle 2θ range 10-28° can be assigned to P 4 O 7 [21] and has been previously observed in the pyrolysis of organometallic derivatives of polyphosphazenes [22] and cyclotriphosphazenes. [23,27] In addition, some relatively weak reflections are observed at 2θ = 5.9° and 6.4° suggest the formation of quantities of hexagonally ordered mesoporous SiO 2 . [28] The SEM images exhibit a tridimensional porous network, as is shown in Fig.…”

Section: Synthesis Of Model Precursorsmentioning

confidence: 99%

Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization

Dı́az

Valenzuela

Bravo

et al. 2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Synthesis Of Model Precursorsmentioning

confidence: 99%

Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization

Dı́az

Valenzuela

Bravo

et al. 2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…Employing pure PEO as the polymer, the only parameter apart from the salt/polymer ratio that can be tuned for optimization is the molecular weight: At low molecular weight the electrolyte becomes fluid, whereas at high molecular weight the conductivity is low. To avoid these limitations, many groups have worked on an optimization of the polymer architecture and studied a range of different polymer electrolytes [6,7].…”

Section: Introductionmentioning

confidence: 99%

Transport Mechanisms of Ions in Graft-Copolymer Based Salt-in-Polymer Electrolytes

Kunze

Schulz

Wiemhöfer

et al. 2010

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

Polymer Electrolyte / Nuclear Magnetic Resonance / Spin Relaxation / Pulsed Field Gradient NMR / ConductivitySalt-in-polymer electrolytes based on graft copolymers with oligoether side chains and added LiCF 3 SO 3 (LiTf) are investigated concerning the transport and dynamics of the ionic species with respect to applications as Li ion conductors. Polymer architectures are based on polysiloxane or polyphosphazene backbones with one or two side chains per monomer, respectively. NMR methods provide information about molecular dynamics on different length scales: The mechanisms governing local dynamics and long range mass transport are studied on the basis of temperature dependent spin-lattice relaxation rates and pulsed field gradient diffusion measurements for 7 Li, 19 F and 1 H, respectively. The correlation times characterizing local ion dynamics reflect the complexation of the cations by the oligoether side chains of the polymer.7 Li and 19 F diffusion coefficients and their activation energies are rather similar, suggesting the formation of ion pairs and clusters with similar activation barriers for cation and/or anion long-range transport. Activation energies of local reorientations are generally significantly smaller than activation energies of long range diffusion. Long range transport is affected by (1) the coupling of conformational side chain reorientations to the cation movement, and (2) the correlated diffusion of cations and anions within ion pairs. Ion pairs and their dissociation play a major role in controlling the resulting conductivity of the material. Guidelines for material optimization in terms of a maximized conductivity can thus be derived by identifying a compromise between high ionic mobility and good Li complexation by the coordinating side chains.

show abstract

“…The side groups linked to phosphorus atoms and the ratio in which they are located over the backbone are the main factors determining its physicochemical and chemistry properties. These polymers has been used widely for multiple applications [2]. In earlier works was described the synthesis and characterization of COOH−, as well NO 2 [3].…”

Section: Introductionmentioning

confidence: 99%

“…These polymers has been used widely for multiple applications [2]. In earlier works was described the synthesis and characterization of COOH−, as well NO 2 [3]. Recently was reported the synthesis of NO 2 −functionalized polyspyrophosphazenes, where the regioselective and controlled direct nitration of the homopolymer [NP(O 2 C 12 H 8 )] n , [4] was achieved by taking advantage of the unusual high solubility and stability of the precursor in concentrated sulfuric acid, to obtain in one-pot {NP[O 2 C 12 H 8- (2), with x between 0.2 and 2 with excellent yields [5].…”

Section: Introductionmentioning

confidence: 99%

Electroanalytical Analysis of Glassy Carbon Electrode Modified With Cooh- And No2- Functionalized Polyspyrophosphazenes

Valenzuela

Cisternas

Jara‐Ulloa

et al. 2017

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

Glassy carbon electrode modified with COOH− and NO 2 −functionalized polyspyrophosphazenes were used to study the redox process of a electroactive probe (ferrocene) in non-aqueous electrolyte. The electrochemical behavior of polyphosphazenes substituted with COOH and NO 2 groups has been studied using cyclic voltammetry. Their blocking properties depend on the substituent group and on the substitution/nitration degree. The oxoreduction of the couple Fc/Fc + occurs with rapid redox kinetic at the modified glassy carbon electrode with high nitration degree NO 2 −functionalized polyspyrophosphazene. The polymers were immobilized on the glassy carbon surface at different concentrations to study surface charge density effect. In this report were studied the reproducibility, repeatability and stability of the modified electrodes.

show abstract

Polyphosphazenes: A Review

Cited by 96 publications

References 5 publications

Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization

Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization

Transport Mechanisms of Ions in Graft-Copolymer Based Salt-in-Polymer Electrolytes

Electroanalytical Analysis of Glassy Carbon Electrode Modified With Cooh- And No2- Functionalized Polyspyrophosphazenes

Contact Info

Product

Resources

About