Preparation of porous carbon films by the pyrolysis of poly(urethane-imide) films and their pore characteristics

Takeichi, Tsutomu; Yamazaki, Yutaka; Zuo, Min; Ito, Akihiro; Matsumoto, Akihiko; Inagaki, Michio

doi:10.1016/s0008-6223(00)00117-2

Cited by 60 publications

(28 citation statements)

References 11 publications

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“…This is attributable to the increase in domain size of phase-separated PPG block in the polyimide matrix with increasing PPG content. 22,27,28 There was difficulty in measuring dielectric constants of the porous films: impedance measurements and refractive index measurements were performed, but reliable data could not be obtained.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous thin films of fully alicyclic polyimides

Kumar

Song

et al. 2011

Macromol. Res.

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Nanopore generation could be accomplished in thin films of fully alicyclic polyimides derived from an alicyclic dianhydride and diamines. A silylation method for the alicyclic diamines was used to synthesize high molecular weight alicyclic polyimides. Triblock copolyimides were prepared using N-silylated alicyclic diamines, alicyclic dianhydride, and a thermally labile polymer. Nanoporous films of fully alicyclic polyimides were prepared through heating of the copolyimide films to induce thermal degradation of the labile block.

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Section: Resultsmentioning

confidence: 99%

Nanoporous thin films of fully alicyclic polyimides

Kumar

Song

et al. 2011

Macromol. Res.

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“…Further polymers undergo a structural change together with the evolution of gaseous molecules by the decomposition at high temperatures, they transform a spongy, bright black porous residues. 49 This high resistance to flame might be attributed to the fully aromatic structure of polymer molecules together with the presence of phosphorus and halogen atoms in the structures. A considerable difference was not detected between the PUIs 5a-d containing methyl group and 6a-d containing phenyl group in the diisocyanate monomers.…”

Section: Thermal and Flame Retardant Propertiesmentioning

confidence: 99%

Preparation and properties of flame retardant poly(urethane‐imide)s containing phosphine oxide moiety

Özarslan

Bayazit

Çatıker

2009

J of Applied Polymer Sci

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The preparation of new poly(urethaneimide)s (PUIs) having acceptable thermal stability and higher flame resistance was aimed. Two new aromatic diisocyanate-containing methyldiphenylphosphine oxide and triphenylphosphine oxide moieties were synthesized via Curtius rearrangement in situ and polymerized by various prepared diols. Four aliphatic hydroxy terminated aromatic based diols were synthesized by the reaction between ethylene carbonate and various diphenolic substances. Chemical structures of monomers and polymers were characterized by FTIR, 1 H NMR, 13 C NMR, and 31 P NMR spectroscopy. Thermal stabilities and decomposition behaviors of the PUIs were tested by DSC and TGA. Thermal measurements indicate that the polymers have high thermal stability and produce high char. Polymers exhibit quite high fire resistance, evaluated by fire test UL-94. The films of the polymers were prepared by casting the solution. Inherent viscosities, solubilities, and water absorbtion behaviors of the polymers were reported in. V

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“…These electrodes can be modeled as arrays of cylindrical pores, each with a capacitance of Table 4-1 presents the predicted number of moles stored per liter of electrode volume per volt as a function of pore radius. Pores in the 1-10 nm range are achievable through various methods, including pyrolysis of templated polymers to form porous carbon electrodes, [96] reduction of metals in surfactant templates, [37,38] and dealloying. [97] These structures are not square arrays of uniform cylindrical pores, and specific adsorption can affect the amount delivered, [98] but this model can still closely capture their behavior.…”

Section: Capacitive Deliverymentioning

confidence: 99%

Optimized nanoporous materials.

Langham¹,

Jacobs²,

Ong³

et al. 2009

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Nanoporous materials have maximum practical surface areas for electrical charge storage; every point in an electrode is within a few atoms of an interface at which charge can be stored. Metal-electrolyte interfaces make best use of surface area in porous materials. However, ion transport through long, narrow pores is slow. We seek to understand and optimize the tradeoff between capacity and transport. Modeling and measurements of nanoporous gold electrodes has allowed us to determine design principles, including the fact that these materials can deplete salt from the electrolyte, increasing resistance. We have developed fabrication techniques to demonstrate architectures inspired by these principles that may overcome identified obstacles. A key concept is that electrodes should be as close together as possible; this is likely to involve an interpenetrating pore structure. However, this may prove extremely challenging to fabricate at the finest scales; a hierarchically porous structure can be a worthy compromise.

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Preparation of porous carbon films by the pyrolysis of poly(urethane-imide) films and their pore characteristics

Cited by 60 publications

References 11 publications

Nanoporous thin films of fully alicyclic polyimides

Nanoporous thin films of fully alicyclic polyimides

Preparation and properties of flame retardant poly(urethane‐imide)s containing phosphine oxide moiety

Optimized nanoporous materials.

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