Probing the ordering of semiconducting fluorene - Thiophene copolymer surfaces on rubbed polyimide substrates by near-edge X-ray absorption fine structure

Macromolecules

Volumn 39, Issue 6, 2006, Pages 2225-2231

  Pattison, Lisa R ^a   Hexemer, Alexander ^a   Kramer, Edward J ^a   Krishnan, Sitaraman ^c   Petroff, Pierre M ^a   Fischer, Daniel A ^b  

^a University of California   (United States)

^b NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY   (United States)

^c School of Operations Research and Industrial Engineering   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ISOTROPIC TRANSITION; SURFACE ORIENTATION; THIN FILM SURFACES;

ANNEALING; GLASS; POLYIMIDES; QUENCHING; SEMICONDUCTOR MATERIALS;

LIQUID CRYSTALS;

EID: 33645829030     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0521912     Document Type: Article

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23. 13 who define S of the π* TDM relative to the surface normal (z-axis). Defining 5 of the molecular axis as we do here allows comparison of this value with the conventional uniaxial order parameter of a nematic liquid crystal.
24. Though η > 0, the positive value of η is not as large as for the case of a perfectly random, homogeneous film, showing that there is some preferential on-edge alignment of the molecules at the surface or some out of plane tilt of molecular axes, but this is very slight. The decay in η with high-temperature annealing could be due to the rotation of molecular axes out of the substrate plane as thermal energy increases, allowing out-of-plane tilt.