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Author

Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
Research Interests
  • Covalent Organic Frameworks (COFs), Carbon Nanotubes(CNTs), graphene, Energy Conversion and Storage

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Multifunctional Poly(2,5-benzimidazole)/Carbon Nanotube Composite Films

Cited 8 times inthomson ciCited 8 times inthomson ci
Title
Multifunctional Poly(2,5-benzimidazole)/Carbon Nanotube Composite Films
Author
Kang, Ji-YeEo, Soo-MiJeon, In-YupChioi, Yeong SukTan, Loon-SengBaek, Jong-Beom
Keywords
Benzimidazoles; High performance polymer; High-performance polymers; In-situ polymerization; Poly (phosphoric acid); Poly(2,5-benzimidazole)
Issue Date
201003
Publisher
JOHN WILEY & SONS INC
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.48, no.5, pp.1067 - 1078
Abstract
The AB-monomer, 3,4-diaminobenzoic acid dihydrochloride, was recrystallized from an aqueous hydrochloric acid solution and used to synthesize high-molecular-weight poly(2,5-benzimidazole) (ABPBI). ABPBI/carbon nanotube (CNT) composites were prepared via in situ polymerization of the AB-monomer in the presence of single-walled carbon nanotube (SWCNT) or multiwalled carbon nanotube (MWCNT) in a mildly acidic polyphosphoric acid. The ABPBI/SWCNT and ABPBI/MWCNT composites displayed good solubility in methanesulfonic acid and thus, uniform films could be cast. The morphology of these composite films was studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The results showed that both types of CNTs were uniformly dispersed into the ABPBI matrix. Tensile properties of the composite films were significantly improved when compared with ABPBI, and their toughness (similar to 200 MPa) was close to the nature's toughest spider silk (similar to 215 MPa). The electrical conductivities of ABPBI/SWCNT and ABPBI/MWCNT composite films were 9.10 x 10(-5) and 2.53 x 10(-1) S/cm, respectively, whereas that of ABPBI film was 4.81 X 10(-6) S/cm. These values are similar to 19 and 52,700 times enhanced by the presence of SWCNT and MWCNT, respectively. Finally, without acid impregnation, the ABPBI film was nonconducting while the SWCNT- and MWCNT-based composites were proton conducting with maximum conductivities of 0.018 and 0.017 S/cm, respectively.
URI
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DOI
http://dx.doi.org/10.1002/pola.23862
ISSN
0887-624X
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