Carbonization of polyimide films: Effect of cold‐drawing and chemical structure

Takeichi, Tsutomu; Takenoshita, H.; Ogura, Satoshi; Inagaki, Michio

doi:10.1002/app.1994.070540310

Cited by 19 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is expected that utilization of polyamide carbonization and graphitization. 4,5,9,10 As a reacid alkyl ester as a precursor, instead of polyamsult, we found that when imidization of a polyamide acid, would give a polyimide film with higher ide acid film was carried out as fixed on a glass orientation of the molecules along the film sursubstrate, high quality graphitized film could be face, because polyamide acid alkyl ester imidizes by losing alcohols, which are larger molecules than water molecules.…”

Section: Introductionmentioning

confidence: 95%

Carbonization and graphitization of polyimide films: Effect of size of leaving group at imidization

Takeichi

Endo

Kaburagi

et al. 1998

J. Appl. Polym. Sci.

Self Cite

View full text Add to dashboard Cite

Polyamide acid was prepared from pyromellitic dianhydride and p-phenylenediamine and was then reacted with NaH and various kinds of alkyl halides to transform into alkyl esters. The cast films were imidized as fixed on glass substrate to give polyimide films and were then carbonized by heating to 900ЊC. The electrical conductivity of the carbonized films decreased with the increase of the size of the leaving group at the imidization step. The carbonized films were further heated to 2800ЊC for graphitization. Their degrees of graphitization and orientation of the graphite crystallite as a function of weight loss at imidization were studied by X-ray diffraction measurement at room temperature and magnetoresistance measurement at liquid nitrogen temperature. Both measurements clearly indicate that the graphitized films prepared from polyamide acid alkyl ester have high degrees of graphitization. It was also made clear that the orientation of the graphitized films increased with the increase of the size of the leaving group at the imidization step.

show abstract

Section: Introductionmentioning

confidence: 95%

Carbonization and graphitization of polyimide films: Effect of size of leaving group at imidization

Takeichi

Endo

Kaburagi

et al. 1998

J. Appl. Polym. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Especially, carbonization and graphitization of PI were extensively studied because of the molecular design flexibility of PI. The effects of chemical structure of PI [4], cold-drawing of PI film [5][6][7], and constraint during imidization of poly(amide acid) [8] on carbonization and graphitization have been extensively reported on the Kapton type PI, PI(PMDA/ODA) [9], and other PI films [10][11][12][13][14]. It was also revealed that carbonization of PI films give microporous carbon films by thermally treating PI films at 700-900 °C [15,16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Carbon Films Prepared from Polybenzoxazine Films

Takahashi

Osawa

Shibayama

et al. 2015

J. Photopol. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Two types of polybenzoxazine films, PBa and PPd, that were prepared by the thermal cure of benzoxazines, Ba and Pd, were carbonized at temperature-controlled condition, and the effect of the chemical structure of the polybenzoxazines on carbonization was examined by comparing with the carbonization behavior of polyimide film. X-ray diffraction and X-ray photoelectron spectra measurements showed that the carbon films prepared by heat treatment of rigid polybenzoxazine, PPd, at 900 °C and 1000 °C were the most graphitized. Micrographitic structure was confirmed by transmission electron microscope observation for the carbonized films of PBa and PPd at 1000 °C.

show abstract

“…29 In this study, polyimide-based porous carbon/crystalline composite absorbers (PIC/rGO and PIC/CNT) were prepared by vacuum freeze-drying and high-temperature pyrolysis. PIs were chosen as the carbon source because they have excellent thermal stability, 30 a simple graphitization process, 31 and a high carbon yield. 32 Furthermore, rGO and CNT were introduced to adjust the crystalline carbon content in the materials.…”

Section: Introductionmentioning

confidence: 99%