T S Chow 2002 J. Phys.: Condens. Matter 14 L333 doi:10.1088/0953-8984/14/19/101
T S Chow
Show affiliationsOn the basis of the nanoscale fluctuations of the excess number density of holes (free volumes), a theoretical model is developed to describe the glass transition temperature (Tg) of polymeric films with the thickness < 100 nm. A Langevin equation is used in the derivation that helps us to understand the dependence of Tg not only on film thickness but also on molecular weight. Substrates have a strong influence on Tg and the diffusion coefficient of nanofilms, and the surface concentration of adsorbed chain ends depends on the strength of polymer-substrate interactions.
64.70.P- Glass transitions of specific systems
61.41.+e Polymers, elastomers, and plastics
68.55.-a Thin film structure and morphology
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 19 (20 May 2002)
Received 13 February 2002
Published 2 May 2002
T S Chow 2002 J. Phys.: Condens. Matter 14 L333
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