Jukes, Paul C., Das, Arindam, Durell, Martin, Trolley, Dean, Higgins, Anthony M., Geoghegan, Mark, Macdonald, John Emyr  ORCID: https://orcid.org/0000-0001-5504-1692, Jones, Richard A. L., Brown, Simon and Thompson, Paul
2005.
Kinetics of surface crystallization in thin films of poly(ethylene terephthalate).
Macromolecules
38
(6)
, pp. 2315-2320.
10.1021/ma0490606
|
Abstract
In-situ grazing incidence X-ray diffraction has been used to investigate the kinetics of crystallization at the surface of thin films of poly(ethylene terephthalate) (PET). By varying the angle of incidence of the X-ray beam around the critical angle 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. The results show that ordering occurs significantly faster at the surface in the temperature range 90−100 °C (close to the bulk glass transition temperature of 75 °C). The (0 1̄ 1) and (0 1 0) peaks narrow more rapidly and achieve a lower width, indicating that the crystallization progresses more rapidly in these crystallographic directions. This enhanced ordering is attributed to a combination of surface energy effects, which promote localized packing, and to an enhanced segmental mobility near the free surface.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Subjects: | Q Science > QC Physics |
| Publisher: | ACS Publications |
| ISSN: | 0024-9297 |
| Last Modified: | 24 Oct 2022 10:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/45734 |
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