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PS T g atop P4VP underlayer

Tuning the Glass Transition Temperature of Thin Polymer Films by 100 ºC by Nanoscale Confinement Soyoung Kim, Connie B. Roth, Rodney D. Priestley, John M. Torkelson Northwestern University Materials Research Science and Engineering Center DMR-0520513.

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PS T g atop P4VP underlayer

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  1. Tuning the Glass Transition Temperature of Thin Polymer Films by 100 ºC by Nanoscale Confinement Soyoung Kim, Connie B. Roth, Rodney D. Priestley, John M. Torkelson Northwestern University Materials Research Science and Engineering Center DMR-0520513 Previous studies have shown that the glass transition temperature (Tg) of a single-layer polymer film is function of nanoscale film thickness (h < 100 nm). The polymer-air and polymer-substrate interface perturb the cooperative dynamics, changing Tg. Here, we demonstrate a new effect, in which a sufficiently thin polystyrene (PS) film can have its Tg dynamics ‘slaved’ to those of an underlayer film of a second immiscible polymer. PS Tg atop P4VP underlayer PS Tg atop P2VP underlayer PS Tg atop PnBMA underlayer The Tg of a polystyrene film can be tuned by 100 oC simply by choice of the underlayer polymer and film thickness. Thus, nanoconfined multilayer films can yield novel properties not obtainable with conventional immiscible polymer blends.

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