Glass “transition” and heterogeneity

The origin of the liquid-to-glass “transition” and the nature of the glassy state is one of the 100 "what don't we know" questions posed by Science at its 125 years birthday. The combination of ansamble average techniques with single-molecule spectroscopy has shed more light in this problem [4]. In addition, the combination of dielectric spectroscopy with molecular simulations as a function of temperature and pressure is a powerful tool.

Collaborators: K. Matyjaszewski (CMU), J. Hofkens (KUL), V. Harmandaris (Univ. of Crete)

Recent publications (2011-2016)

[1] A. Deres, G. Floudas, K. Müllen, M. Van der Auweraer, F. De Schryver, J. Enderlein, H. Uji-i, J. Hofkens

“The origin of heterogeneity of polymer dynamics near the glass temperature as probed by defocused imaging”, 

Macromolecules 44, 9703, 2011.

[2] V. Harmandaris, G. Floudas, K. Kremer

“Temperature and pressure dependence of polystyrene dynamics through molecular dynamics simulations and experiments”, 

Macromolecules 44, 393, 2011.

[3] C.Grigoriadis, A. Nese, K. Matyjaszewski, T. Pakula, H.-J. Butt, G. Floudas

“Dynamic homogeneity by architectural design – Bottlebrush polymers”

Macromol. Chem. Phys. 213, 1311, 2012.

[4] P. Panagos, G. Floudas  

“Dynamics of poly(propyl methacrylate) as a function of temperature and pressure”

J. Non.-Cryst. Solids 407, 184-189, 2015.

[5] S. Alexandris, A. Franczyk, G. Papamokos, B. Marciniec, K. Matjaszewski, K. Koynov, M. Mezger, G. Floudas

 “Polymethacrylates with polyhedral oligomeric silsesquioxane (POSS) moieties: influence of spacer length on packing, thermodynamics, and dynamics”

Macromolecules 48, 3376-3385, 2015.

[6] A. Aluculesei, A. Pipertzis, V.A. Piunova, G.M. Miyake, G. Floudas, G. Fytas, R.H. Grubbs  

“Thermomechanical behavior and local dynamics of dendronized block copolymers and constituent homopolymers”

Macromolecules 48, 4142-4150, 2015.