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Concentration effect on the oriented microstructure in tensile drawn polyfluorene-polyethylene blend
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Knaapila, Matti, Vaughan, Helen L., Hase, Thomas P. A., Evans, Rachel C., Stepanyan, Roman, Torkkeli, Mika, Burrows, Hugh D., Scherf, Ullrich and Monkman, Andrew P. (2010) Concentration effect on the oriented microstructure in tensile drawn polyfluorene-polyethylene blend. Macromolecules, Vol.43 (No.1). pp. 299-305. doi:10.1021/ma9018069 ISSN 0024-9297 .
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Official URL: http://dx.doi.org/10.1021/ma9018069
Abstract
We report on the segregation and microstructure of poly[9,9-bis(2-ethylhexyl)-fluorene] (PF2/6) blended in polyethylene (PE) aligned by tensile drawing at elevated temperature. X-ray diffraction and photoluminescence data indicate that when the PF2/6 fraction is high (7-15 wt %), PF2/6 assembles in uniaxially aligned crystallites (the coherence length similar to 32 nm) segregated within the PE matrix. The full-width-half-maximum of the PF2/6 crystallite orientation distribution about the stretching direction is <= 10 degrees. No significant macrophase separation is observed with A FM or optical and fluorescence microscopy. When the PF2/6 fraction is low (0.25 wt %), aligned PF2/6 forms a frozen-in nematic-like phase. The aligned polymers remain closely located bill their coherence length is significantly decreased (similar to 8 nm), which is attributed to the decreased crystallite size. This behavior differs from that of poly(phenylene-vinylene) type polymers and the difference is rationalized by compatibility and entanglement arguments.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Microstructure, Polyfluorenes, Polyethylene, Phase rule and equilibrium | ||||
| Journal or Publication Title: | Macromolecules | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 0024-9297 | ||||
| Official Date: | 12 January 2010 | ||||
| Dates: |
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| Volume: | Vol.43 | ||||
| Number: | No.1 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | pp. 299-305 | ||||
| DOI: | 10.1021/ma9018069 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Funder: | European Commission (EC), XMaS project, Fundação para a Ciência e a Tecnologia (FCT) | ||||
| Grant number: | RII3-CT-2004-506008 (EC), SFRH/BPD/42450/2007 (FCT) |
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