Electrically conductive polyimide films containing palladium coordination complexes

Clair, Anne K. St.; Carver, Victoria; Taylor, Larry T.; Furtsch, T. A.

doi:10.1021/ja00522a089

Cited by 25 publications

(8 citation statements)

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“…It is very important that a qualified dopant has good solubility in the solution of polyimide precursor and good compatibility with other components in doping system 9, 10. In this study, much attention has been paid to the selection of barium and the titanium precursor.…”

Section: Resultsmentioning

confidence: 99%

“…For these specific applications a great deal of researches have been devoted to the synthesis of modified polyimides and polyimide composite materials that exhibit unique physical properties. The incorporation of various metallic additives, such as TiO 2 , into polyimides by doping procedure has been reported to improve mechanical, electrical, and optical properties 4–9. In most cases, however, a heterogeneous distribution of the oxide particles with markedly high concentration on or near the polymer surface was often observed 6–8.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of polyimide films codoped with barium and titanium oxides

Tong

Liu

et al. 2001

J of Applied Polymer Sci

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Polyimide hybrid films containing bimetalic compounds were obtained by codoping poly(amic acid) with a barium and titanium precursor prepared from BaCO 3 , Ti(OBu) 4 , and lactic acid followed by casting and thermal curing. FTIR, WAXD, and XPS measurements showed that barium and titanium precursor could be transformed to BaTiO 3 at a temperature above 650°C, while the mixed oxides were only found in hybrid films. The measurements of TEM and AFM indicated a homogeneous distribution of inorganic phase with particle sizes less than 50 nm. The hybrid films exhibited fairly high thermal stability, good optical transparency, and promising mechanical properties. The incorporation of 10 wt % barium and titanium oxide lowered surface and volume electrical resistivity by 2 and 5 orders, respectively, increasing dielectric constant from 3.5 to 4.2 and piezoelectric constant from 3.8 to 5.2 ϫ 10 Ϫ12 c/N, relative to the nondoped polyimide film.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polyimide films codoped with barium and titanium oxides

Tong

Liu

et al. 2001

J of Applied Polymer Sci

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“…A single‐step method for incorporating metal into polymer substrates has been established whereby the metal is introduced into the dissolved polymer via dissolution as an organometallic complex in the same solvent as the polymer and subsequently mixed. 2, 3, 5, 7, 17–21 This solution is then cast and thermally treated thereby forming nanoparticles. Previous research has shown, for example, a marked improvement in the gas‐barrier properties in films while not greatly affecting any other mechanical properties 7, 18.…”

Section: Introductionmentioning

confidence: 99%

Human Chymotrypsinogen B Production with Pichiapastoris by Integrated Development of Fermentation and Downstream Processing. Part 1. Fermentation

Curvers

Brixius

Klauser³

et al. 2001

Biotechnology Progress

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Based on an integrated approach of genetic engineering, fermentation process development, and downstream processing, a fermentative chymotrypsinogen B production process using recombinant Pichia pastoris is presented. Making use of the P. pastoris AOX1-promotor, the demand for methanol as the single carbon source as well as an inducer of protein secretion enforced the use of an optimized feeding strategy by help of on-line analysis and an advanced controller algorithm. By using an experimental system of six parallel sparged column bioreactors, proteolytic product degradation could be minimized while also optimizing starting conditions for the following downstream processing. This optimization of process conditions resulted in the production of authentic chymotrypsinogen at a final concentration level of 480 mg‚L -1 in the whole broth and a biomass concentration of 150 g‚L -1 cell dry weight, thus comprising a space-time yield of 5.2 mg‚L -1 ‚h -1 . Alternatively to the high cell density fermentation approach, a continuous fermentation process was developed to study the effects of reduced cell density toward oxygen demand, cooling energy, and biomass separation. This development led to a process with a highly increased spacetime yield of 25 mg‚L -1 ‚h -1 while reducing the cell dry weight concentration from 150 g‚L -1 in fed-batch to 65 g‚L -1 in continuous cultivation.

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“…It has been reported that doping of some insulating polymers with dissolved metal salts can increase the electrical conductivity of polymers 11. Through in situ polymerization, a series of polyimides have been metallized with various metal salts to improve their surface and volume conductivities 12–15. Alternatively, the supercritical fluid (SCF) impregnation method has been introduced to metallize solid polymers through dissolving an organometallic compound in supercritical carbon dioxide (CO 2 ) within a pressurized chamber 16.…”

Section: Introductionmentioning

confidence: 99%

Metallized nanotube polymer composites via supercritical fluid impregnation

Park

Kim

Sauti

et al. 2011

J Polym Sci B Polym Phys

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Although many metal decorated nanotubes and nanowires appear in the literature, well-dispersed metal decorated nanotube polymer composites have rarely been reported because of the excessive density mismatch between the decorated nanotubes and polymer matrix. Here, we report a novel method to prepare well-dispersed, highly functional, metallized nanotube polymer composites (MNPCs) that possess remarkably improved electrical conductivity and mechanical toughness. The MNPCs are prepared by supercritical fluid impregnation of an organometal compound into a premade well-dispersed single wall carbon nanotube-polymer composite film. The infused precursor preferentially migrates towards the nanotubes to undergo spontaneous reduction and form nanometer-scale metal particles leading to an increase in the conductivity of the MNPC films. The environmentally friendly supercritical fluid impregnation process significantly improved the toughness of the composite films, regardless of the presence of metal. Additional functionality can be imparted into the resulting MNPC by infusing other precursors such as magnetic and catalytic metal compounds.

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Electrically conductive polyimide films containing palladium coordination complexes

Cited by 25 publications

References 1 publication

Preparation and properties of polyimide films codoped with barium and titanium oxides

Preparation and properties of polyimide films codoped with barium and titanium oxides

Human Chymotrypsinogen B Production with Pichiapastoris by Integrated Development of Fermentation and Downstream Processing. Part 1. Fermentation

Metallized nanotube polymer composites via supercritical fluid impregnation

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