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. ISSN 0024-9297

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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
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of 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
Volume:	Vol.43
Number:	No.1
Number of Pages:	7
Page Range:	pp. 299-305
Identification Number:	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)
URI:	http://wrap.warwick.ac.uk/id/eprint/16675

Data sourced from Thomson Reuters' Web of Knowledge

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