Abstract
AbstractThe surface molecular motion of polymeric solids was investigated on the basis of scanning force microscopic and temperature‐dependent X‐ray photoelectron spectroscopic measurements. The surface of the monodisperse polystyrene films was in a glass‐rubber transition state even at 293 K in the case of number‐average molecular weight less than ca. 30k. The surface glass transition temperature, Tgs for the symmetric poly(styrene‐block‐methyl methacrylate) diblock copolymer films were much lower than those for the bulk samples. A remarkable depression of Tg at the air‐polymer interface was explained by the surface localization of chain end groups.
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