Eliminating the Enhanced Mobility at the Free Surface of Polystyrene:  Fluorescence Studies of the Glass Transition Temperature in Thin Bilayer Films of Immiscible Polymers

2007 ◽  
Vol 40 (7) ◽  
pp. 2568-2574 ◽  
Author(s):  
Connie B. Roth ◽  
Katie L. McNerny ◽  
Wolter F. Jager ◽  
John M. Torkelson
Keyword(s):  
Glass Transition ◽  
Free Surface ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Fluorescence Studies ◽  
Immiscible Polymers ◽  
Bilayer Films ◽  
Enhanced Mobility

Study on Glass Transition Temperature of Amorphous Polymer Thin Film

2012 ◽  
Vol 482-484 ◽  
pp. 1457-1460
Author(s):  
Yi Jin Ren
Keyword(s):  
Thin Film ◽  
Glass Transition ◽  
Free Surface ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Film Thickness ◽  
Amorphous Polymer ◽  
Dominant Factor ◽  
Polymer Thin Film ◽  
Air Interface

The glass transition temperaure Tg of amorphous polymer thin film was investigated. The opposite experimental results, the increase or decrease in Tg of thin film with decreasing film thickness, were found. It was believed that the free surface near the polymer-air interface has a smaller chain ends density, leading to the decrease in Tg; while the polymer-substrate interface has a larger chain ends density, resulting in the increase in Tg. However, there are a competition between the both, and the interaction of polymer and substrate is a dominant factor to affect Tg of thin film. In addition, the multilayer model of thin film was proposed to explain the effect of the free surface and the interface on the Tg of thin film.

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