Segmental α-Relaxation for the First Step and Sub-Rouse Modes for the Second Step in Enthalpy Recovery in the Glassy State of Polystyrene

摘要: Cangialosi and co-workers found two steps in the enthalpy recovery deep glassy state of high low molecular weight bulk polystyrene (PS). We attribute first step to segmental α-relaxation second sub-Rouse modes explain two-step by dynamic properties processes PS coupling model (CM). The was nanometer thin films On decreasing film thickness h, shifted much lower temperature than step, effect is explained shifting more modes, as predicted CM. Furthermore, dependences faster slower relaxation on are analogues effects observed h freestanding films. One observation transitions ellipsometry. associated tran...