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] P. Panagos, G. Floudas  

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

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

[2] 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 2015, 48, 3376-3385.

[3] 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 2015, 48, 4142-4150.

[4] T. Dimitriadis, D. N. Bikiaris, G. Z. Papageorgiou, G. Floudas. 

“Molecular Dynamics of Poly(ethylene - 2,5 - furonoate) (PEF) as a function of the degree of Crystallinity by Dielectric Spectroscopy and Calorimetry”

Macromol. Chem. Phys. 2016, 217, pp. 2056-2062.

[5] A. Pipertzis, A. Hess, P. Weis, G. Papamokos, K. Koynov, S. Wu, G. Floudas. 

“Multiple Segmental Processe in Polymers with cis and trans Stereoregular Configurations”

ACS Macro Lett. 2018, 7 (1), pp. 11-15.

[6] A. Pipertzis, Md. D. Hossain, M. J. Monteiro, G. Floudas. 

“Segmental Dynamics in Multicyclic Polystyrenes”

Macromolecules 2018, 51 (4), pp. 1488-1497.

[6] M. Hesami, W. Steffen, H-J. Butt, G. Floudas, K. Koynov. 

“Molecular Probe Diffusion in Thin Polymer Films: Evidence for a Layer with Enhanced Mobility Far above the Glass Temperature”

ACS Macro Lett. 2018, 7 (4), pp. 425-430.

[6] M. Mauri, G. Floudas, R. Simonuti. 

“Local Order and Dynamics of Nanoconstrained Ethylene-Butylene Chain Segments in SEBS”

Polymers 2018, 10, pp. 655.

[6] G. Papamokos, T. Dimitriadis, D. N. Bikiaris, G. Z. Papageorgiou, G. Floudas. 

“Chain Conformation, Molecular Dynamics, and Thermal Properties of Poly(n-methylene 2,5-furanoates) as a Function of Methylene Unit Sequence Length”

Macromolecules 2019, 52 (17), 6533-6546.

[7] S. Constanzo, L. Scherz, G. Floudas, R. Pasquino, M. Kröger, A. D. Schlüter, D. Vlassopoulos. 

“Hybrid Dendronized Polymers as Molecular Objects: Viscoelastic Properties in the Melt”

Macromolecules 2019, 52 (19), 7331-7342.