Overture

Ivin, K. J.

doi:10.1007/978-94-011-3328-9_1

Cited by 6 publications

(3 citation statements)

References 133 publications

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“…Because of the mixture of isomers of 5-norbornene-2-methanol used for the synthesis of the monomers, the final polymers are presumed to be random copolymers with statistical distributions of isomers along the backbone. In addition, because norbornenes substituted at the 5-position are asymmetrical, a variety of repeat unit regioisomers are formed including head-to-head (HH), head-to-tail (HT), and tail-to-tail (TT) repeat units . Proton NMR spectra showed typical broad resonances at 4.9−5.4 ppm for the olefinic protons, and the cis contents could not be determined quantitatively at these monomer-to-initiator ratios, due to peak overlap.…”

Section: Resultsmentioning

confidence: 99%

Polynorbornenes Bearing Pendent Cyclotriphosphazenes with Oligoethyleneoxy Side Groups: Behavior as Solid Polymer Electrolytes

et al. 2001

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Three different polynorbornenes (PNB) with pendent cyclotriphosphazene side units that bear different short-chain oligoethyleneoxy side groups were synthesized via ring-opening metathesis polymerization (ROMP). Polymers with methoxyethoxy (−OCH2CH2) n OCH3 (n = 1), di(ethylene glycol) methyl ether (n = 2), and tri(ethylene glycol) methyl ether (n = 3) were synthesized and characterized by multinuclear NMR, GPC, DSC, and elemental analysis. The solid polymers were complexed with LiSO3CF3 and LiN(SO2CF3)2 (10−60% molar ratios), and the ionic conductivities were measured by impedance analysis as a function of temperature. The polymers with methoxyethoxy side units showed no detectable ambient temperature conductivities within the limitations of the impedance analyzer. The conductivities of the other polymer electrolytes increased as the concentration of salt was increased, with similar maximum conductivities found for the di(ethylene glycol) and tri(ethylene glycol) systems (2.1 × 10-5 S/cm at 30 °C with the use of 40 mol % LiN(SO2CF3)2 in both cases). The conductivities showed non-Arrhenius temperature dependence. No melting or crystallization transitions were detected at temperatures above 25 °C for any of polymer−salt complexes tested. Modification of one polymer with −O(CH2CH2O)3CH3 side chains was carried out by epoxidation of the backbone CC bonds.

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Section: Resultsmentioning

confidence: 99%

Polynorbornenes Bearing Pendent Cyclotriphosphazenes with Oligoethyleneoxy Side Groups: Behavior as Solid Polymer Electrolytes

et al. 2001

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“…Polymers 17 , 18 , 19 , 20 , 21 , and 22 were examined by multinuclear NMR, GPC, and DSC analysis. Because of the stereochemical complexities that arise when a mixture of exo- and endo -5-norbornene-2-methanol ( 3 ) is used, it is presumed that a variety of repeat unit regioisomers are formed including head-to-head (HH), head-to-tail (HT), and tail-to- tail (TT) repeat units as shown in Figure …”

Section: Resultsmentioning

confidence: 99%

Ring-Opening Metathesis Polymerization of Phosphazene-Functionalized Norbornenes

et al. 1999

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Ring-opening metathesis polymerization (ROMP) of phosphazene-functionalized norbornenes was demonstrated with the use of (PCy3)2Cl2RuCHPh as catalyst (where Cy ) cyclohexyl). This allowed the incorporation of alkoxy-, fluoroalkoxy-, and aryloxy-derived cyclic phosphazenes as side groups linked to the organic polymer backbone. The polymers were obtained in moderate yields with the properties being dependent on the side groups present and on the molecular weight. The polymers were characterized by multinuclear NMR, DSC, TGA, GPC, elemental analysis, and, in one case, contact angle measurements.

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“…For the purpose of this work, all the macromolecules are assumed to possess a random statistical distribution of the different isomers. The final halogen-free polymers were also asymmetric and contain regioisomers from one repeat unit to another …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Lithium-Ion Conductive Membranes with Low Water Permeation

2007

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Three polymer systems were investigated in an attempt to produce lithium-ion conductive polymers that resist the absorption of water. All were synthesized via ring-opening metathesis polymerization (ROMP) to give a polynorbornene backbone, with each repeat unit bearing a pendent cyclotriphosphazene ring. Each pendent inorganic ring carried hydrophilic, ion conductive 2-(2-methoxyethoxy)ethoxy, and/ or hydrophobic 2,2,2-trifluoroethoxy side groups. The three systems were (a) composite blends of two polymers with all hydrophobic and all lithium ion conductive side groups, (b) homopolymers in which each polymer repeating unit bore both hydrophobic and ion conductive side groups, or (c) copolymers derived from two monomers, one of which bore only hydrophobic side groups and the other with all ion conductive groups. Room-temperature (25 °C) ionic conductivities were measured by incorporating 7 mol % LiBF 4 in each system. Hydrophobicity was estimated from water-contact angles of the polymeric materials with and without LiBF 4 . One of the homopolymer systems with two methoxyethoxyethoxy and three trifluoroethoxy groups on every side group generated conductivities in the range of 1.2 × 10 -5 S/cm at 25 °C in combination with a semihydrophobic surface with a water-contact angle of 77.7 °. The conductivity of this polymer was close to that of the highly hydrophilic, water-soluble poly[bis(2-(2methoxyethoxy)ethoxy)phosphazene] (MEEP), which is one of the most conductive solid polymer electrolytes (2.7 × 10 -5 S/cm at 25 °C).

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Overture

Cited by 6 publications

References 133 publications

Polynorbornenes Bearing Pendent Cyclotriphosphazenes with Oligoethyleneoxy Side Groups: Behavior as Solid Polymer Electrolytes

Polynorbornenes Bearing Pendent Cyclotriphosphazenes with Oligoethyleneoxy Side Groups: Behavior as Solid Polymer Electrolytes

Ring-Opening Metathesis Polymerization of Phosphazene-Functionalized Norbornenes

Synthesis and Characterization of Lithium-Ion Conductive Membranes with Low Water Permeation

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