Orientated crystallization in drawn thermoplastic polyimide modified by carbon nanofibers |
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| Authors: | Valentina E. Smirnova Iosif V. Gofman Vladimir E. Yudin Irina P. Dobrovolskaya Alexander N. Shumakov Andrey L. Didenko Valentine M. Svetlichnyi Ellen Wachtel Rinat Shechter Hannah Harel Gad Marom |
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| Affiliation: | 1. Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russia;2. Chemical Research Infrastructure Unit, Weizmann Institute of Science, 76100 Rehovot, Israel;3. Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel |
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| Abstract: | The solid state crystallization in drawn thermoplastic polyimide films is studied as a function of draw ratio (DR) under the effect of vapor grown carbon fiber nanoinclusions. The nucleating effect of the nanoinclusions coupled with the orientation effect of drawing generates a unique orientated layered lamellar structure, characteristic of smectic‐like mesophase. The degree of draw induced orientated crystallization increases with the content of nanoinclusions and with the DR, and is reflected in the mechanical behavior of the film. Generally, the Young's modulus and the yield point of the drawn crystalline films in the drawing direction are significantly higher compared with the noncrystalline counterparts. POLYM. ENG. SCI., 2009. © 2008 Society of Plastics Engineers |
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