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Competition between substrate-mediated π-π stacking and surface-mediated Tg depression in ultrathin conjugated polymer films

DOI: 10.1140/epje/i2012-12129-3 DOI Help
PMID: 23239269 PMID Help

Authors: Tao Wang (University of Sheffield) , Andrew Pearson (University of Sheffield) , Alan Dunbar (University of Sheffield) , Paul Staniec (Diamond Light Source) , Darren Watters (University of Sheffield) , David Coles (University of Sheffield) , Hunan Yi (University of Sheffield) , Ahmed Iraqi (University of Sheffield) , David Lidzey (University of Sheffield) , Richard A. L. Jones (University of Sheffield)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The European Physical Journal E , VOL 35

State: Published (Approved)
Published: December 2012
Diamond Proposal Number(s): 1203

Abstract: We report surface and interface effects in dynamics and chain conformation in the thin film of conjugated polymer PCDTBT. To probe dynamic anomalies, we measure the glass transition temperature (Tg) of PCDTBT films as a function of thickness, and find that there is a significant depression in Tg for films less than 100nm thick; a result qualitatively similar to that observed in many other polymer film systems. However, for films less than 40nm, the Tg converges to a constant value of 20K below its bulk value. Grazing incidence X-ray diffraction shows depth-dependent molecular organization that is associated with the unusual thickness-dependent dynamics.

Journal Keywords: Radiation Damage; Small Protein Crystals; X-Ray Free-Electron Lasers.

Subject Areas: Physics

Instruments: I16-Materials and Magnetism

Added On: 11/01/2013 12:57

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