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Structural Relaxation of Polymers at the Glass Transition: Conformational Memory in Poly(n-alkylmethacrylates)

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons49009

Wind,  M.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons47957

Graf,  Robert
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48034

Heuer,  Andreas
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48786

Spiess,  Hans Wolfgang
MPI for Polymer Research, Max Planck Society;

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Zitation

Wind, M., Graf, R., Heuer, A., & Spiess, H. W. (2003). Structural Relaxation of Polymers at the Glass Transition: Conformational Memory in Poly(n-alkylmethacrylates). Physical Review Letters, 91(15): 155702.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-6335-7
Zusammenfassung
Conformational memory is introduced as a new aspect of structural relaxation of polymers. In poly(n-alkylmethacrylates) extended backbone chain conformations are identified by advanced NMR techniques as the molecular units involved in structural relaxation. They retain conformational memory over many steps of restricted axial chain motion. Randomization of conformation and isotropization of backbone orientation occur on the same time scale, yet much slower than the slowest relaxation process identified so far. Behavior typical of fragile glass formers is found for this new process of chain relaxation.