Time scales and mechanisms of relaxation in the energy landscape of polymer glass under deformation: direct atomistic modeling.
Molecular-dynamics simulation is used to explore the influence of thermal and mechanical history of typical glassy polymers on their deformation. Polymer stress-strain and energy-strain developments have been followed for different deformation velocities, also in closed extension-recompression loops. The latter simulate for the first time the experimentally observed mechanical rejuvenation and overaging of polymers, and energy partitioning reveals essential differences between mechanical and thermal rejuvenation. All results can be qualitatively interpreted by considering the ratios of the relevant time scales: for cooling down, for deformation, and for segmental relaxation.
Lyulin
Alexey V
AV
Group Polymer Physics, Eindhoven Polymer Laboratories, Technische Universiteit Eindhoven, 5600 MB, Eindhoven, The Netherlands. a.v.lyulin@tue.nl
Michels
M A J
MA
D005898:Glass; D056004:Molecular Dynamics Simulation; D011108:Polymers; D013314:Stress, Mechanical
D011108:Polymers