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Anomalous Behavior of Polystyrene Blends Using Thermally InducedSurface Wrinkling

Published online by Cambridge University Press:  14 March 2011

Jessica M. Torres  and
Bryan D. Vogt
Jessica M. Torres
Affiliation:
Department of Chemical Engineering, Arizona State University, Tempe, AZ 85284
Bryan D. Vogt
Affiliation:
Department of Chemical Engineering, Arizona State University, Tempe, AZ 85284
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Abstract

The wrinkling of a 50:50 blend of a high molecular mass (Mn = 990kg/mol) and low molecular mass (Mn = 1.3 kg/mol) polystyrene (PS)film is studied as a function of annealing temperature and film thickness.Both thermal and mechanical wrinkling are utilized to elucidate the apparentmodulus of these PS blend films. The PS blend shows a modulus comparable tothe high molecular weight PS, ≈ 3.2 GPa for mechanical wrinkling at ambientand thermal wrinkling for T ≤ 50 °C. A sharp decrease in the apparentmodulus of the film occurs when thermal wrinkling occurs at 60 °C or higher.The calculated modulus in this case is 0.5 GPa, which is significantly belowthe modulus determined the neat PS for either Mn when thermallywrinkled at T > 60 °C. This behavior is attributed to a combination ofsurface segregation of the low molecular weight PS as well as the largedifference in bulk glass transition temperature (Tg) of eachcomponent. During thermal wrinkling, the high Mn PS vitrifiesfirst, while the surface containing primarily low Mn PS isrubbery; this leads to only the underlayer of PS wrinkling initially andselection of a shorter wavelength due to the effective thickness. Theincreased thermally induced stresses during cooling when the low Mn PS is vitrified do not change the selected wavelength andinstead only leads to an increase in the wrinkle amplitude. These resultsillustrate a potential method to modulate the wrinkle wavelength withoutchanging the overlayer, which could be useful for patterningapplications.

Keywords

polymernanoscaleelastic properties

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