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Deviation from bulk behaviour in the cold crystallization kinetics of ultrathin films of poly(3-hydroxybutyrate)

S Napolitano and M Wübbenhorst

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The cold crystallization kinetics of ultrathin films of poly(3-hydroxybutyrate) (PHB) have been investigated by dielectric spectroscopy. Upon reduction of the film thickness, a lowering of the Avrami exponent accompanied by an increase of the crystallization time was observed. The experimental results are analysed in terms of reduction of the total number of nuclei involved in the crystallization process.


PACS

64.70.D- Solid–liquid transitions

77.22.Ch Permittivity (dielectric function)

77.84.Jd Polymers; organic compounds

77.55.+f Dielectric thin films

68.55.-a Thin film structure and morphology

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 20 (23 May 2007)

Received 10 October 2006

Published 25 April 2007



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