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Thickness of the soft layer on glassy polystyrene surfaces

✍ Scribed by Pattrawin Gasemjit; Diethelm Johannsmann

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
298 KB
Volume
44
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

The flow behavior of the near‐surface region of polystyrene films was studied via the decay kinetics of imprinted corrugation gratings at elevated temperatures. The speed of the decay is the result of a balance between surface tension, on the one hand, and viscous drag, on the other. Depth profiling is possible because the penetration depth of a surface wave is proportional to its wavelength. From the dependence of the decay rate on the penetration depth one concludes that the surface region displays an increased molecular mobility. The soft surface layer has a thickness of about 20 nm. Β© 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 3031–3036, 2006

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