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Science 24 September 1999:
Vol. 285. no. 5436, pp. 2113 - 2115
DOI: 10.1126/science.285.5436.2113
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Reports

Extrusion Polymerization: Catalyzed Synthesis of Crystalline Linear Polyethylene Nanofibers Within a Mesoporous Silica

Keisuke Kageyama, Jun-ichi Tamazawa, Takuzo Aida *

Crystalline nanofibers of linear polyethylene with an ultrahigh molecular weight (6,200,000) and a diameter of 30 to 50 nanometers were formed by the polymerization of ethylene with mesoporous silica fiber-supported titanocene, with methylalumoxane as a cocatalyst. Small-angle x-ray scattering analysis indicated that the polyethylene fibers consist predominantly of extended-chain crystals. This observation indicates a potential utility of the honeycomb-like porous framework as an extruder for nanofabrication of polymeric materials.

Department of Chemistry and Biotechnology, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
*   To whom correspondence should be addressed. E-mail: aida{at}macro.t.u-tokyo.ac.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Molecular Basis of the Shish-Kebab Morphology in Polymer Crystallization.
S. Kimata, T. Sakurai, Y. Nozue, T. Kasahara, N. Yamaguchi, T. Karino, M. Shibayama, and J. A. Kornfield (2007)
Science 316, 1014-1017
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Control of Energy Transfer in Oriented Conjugated Polymer-Mesoporous Silica Composites.
T. Nguyen, J. Wu, V. Doan, B. J. Schwartz, and S. H. Tolbert (2000)
Science 288, 652-656
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