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Applications of grazing incidence diffraction to polymer surfaces

Macdonald, John Emyr, Durell, M., Trolley, Dean, Lei, C., Das, A., Jukes, P. C., Geoghegan, M., Higgins, A. M. and Jones, R. A. L. 2004. Applications of grazing incidence diffraction to polymer surfaces. Radiation Physics and Chemistry 71 (3-4) , pp. 811-815. 10.1016/j.radphyschem.2004.04.104

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Grazing incidence X-ray diffraction provides a powerful method for determining the structure of the surface region of a polymer thin film. By varying the angle of incidence of the X-ray beam around the critical angle for total reflection of the film, the penetration depth can be tuned to allow a direct comparison of molecular ordering in the surface and bulk of the film. Its application to polymer surfaces is illustrated by in situ studies of the kinetics of crystallisation at the surface of thin films of poly(ethylene terephthalate) (PET) and poly(9,9-dioctylfluorene) (F8), a blue-emitting semiconducting polymer. The results show that ordering occurs significantly faster in PET at the surface in the temperature range 85–100°C (close to the bulk glass transition temperature of 75°C). F8 also shows more rapid ordering at the surface than in the bulk of the film at 87°C. Possible application to developing high-mobility channel regions for polymeric field effect transistors are discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Polymer thin films; Surface crystallisation; Surface X-ray diffraction; Grazing incidence diffraction; Poly(ethylene terephthalate); Poly(9,9-dioctylfluorene); Crystallisation kinetics
Publisher: Elsevier
ISSN: 0969-806X
Last Modified: 24 Sep 2021 01:09

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