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Issue 37, 2013
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Molecular weight dependence of near surface dynamical mechanical properties of polymers

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Abstract

We have made a detailed characterization of the molecular weight dependence of isothermal gold nanoparticle embedding into the surface of atactic polystyrene films. Polymers in the range 3 × 103 < Mw < 1.2 × 106 g mol−1 were used within a temperature range that encompassed the bulk glass transition temperature, around which both Mw dependence and heterogeneous dynamics were measured. The range in Mw also allows for comparison to recent studies on molecular glass surfaces – essentially covering the entire range of possible polymer sizes. The results show that there is a different manifestation of enhanced surface mobility for large and small polymer molecules. The transition between the mechanisms provides some bound on the size of a surface region with enhanced surface dynamics on glassy polystyrene surfaces.

Graphical abstract: Molecular weight dependence of near surface dynamical mechanical properties of polymers

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Article information


Submitted
09 Jun 2013
Accepted
08 Aug 2013
First published
09 Aug 2013

Soft Matter, 2013,9, 8958-8964
Article type
Paper

Molecular weight dependence of near surface dynamical mechanical properties of polymers

D. Qi, C. R. Daley, Y. Chai and J. A. Forrest, Soft Matter, 2013, 9, 8958
DOI: 10.1039/C3SM51601F

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