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Oxidative stabilization of PAN/VGCF composite
Author(s) -
Zhu Dan,
Koganemaru Ai,
Xu Chunye,
Shen Qundong,
Li Suolong,
Matsuo Masaru
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11415
Subject(s) - polyacrylonitrile , materials science , dehydrogenation , composite number , chemical engineering , crystallization , raman spectroscopy , pyromellitic dianhydride , polymer chemistry , fourier transform infrared spectroscopy , composite material , polymer , organic chemistry , chemistry , polyimide , catalysis , physics , optics , layer (electronics) , engineering
An oxidative stabilization process to prepare carbon films was carried out for a new kind of precursor using the composite of polyacrylonitrile (PAN) and vapor‐grown carbon fiber (VGCF) by a process of gelation/crystallization from dilute solutions. It was found that the new precursor has special features in the stabilization process different from those of the homopolymer in regard to thermal and morphological aspects. In the stabilization process under heat treatment at 180–350°C in an oxidative atmosphere, it was inferred that, although the introduction of VGCF hinders the initiation and propagation step of the cyclization and dehydrogenation reactions, the precursor helps the oxidation and the additional aromatization and intermolecular crosslinking reactions in the stabilization process, thus promoting the formation of the later carbon product in film's shape with good performance. From characteristic works by wide‐angle X‐ray diffraction (WAXD), FTIR, Raman, and DSC, the changes of the precursors in structure, morphology, and mechanical property in terms of different heat‐treat temperatures and tensions were studied. Through a series of experimental results, the effect of the VGCF's introduction on those changes was discussed. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 2063–2073, 2003