Paul Sotta
Laboratoire de physique des
solides Université Paris-Sud Bât. 510 91405 Orsay Cedex France
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CV – research - Publications - teaching
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Short autobiography
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1992 Chargé de recherche de première classe,
CNRS 1995-1996 CNRS/MPG Gäst-Wissenschaftler, Max-Planck-Institut für Polymerforschung, Mainz 1988 Chargé de recherche de deuxième classe, CNRS 1987 Thèse de
physique de l’Université Paris-Sud (dir : B. Deloche) Etude par résonance magnétique nucléaire du deutérium, de l’ordre orientationnel local dans un réseau polymère sous contrainte uniaxiale 1984 Ingénieur
de l’Ecole Polytechnique 2005
Habilitation à diriger des Recherches
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Research interests
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My current main research
interests focus on the dynamics of polymers above and close to the glass
transition temperature, in the bulk, in thin films and at interfaces, as well
as the behaviour of filled elastomers. I combine both experimental work (NMR,
Small angle neutron and Xray scattering, thermomechanical analysis) and
numerical simulations. During and after my PhD
thesis, I have studied the local order in elastomers by Nuclear Magnetic
Resonance, mainly deuterium NMR. I demonstrated that the permanent orientational
ordering of polymer segments induced upon macroscopic stretching may be used
advantageously to characterize and study local ordering and/or chain
stretching, i.e. the elastic energy stored in the polymer matrix. I also worked on various
aspects of the physics of liquid crystals: the relationship between structure
and molecular dynamics, directional growth, phase transitions, faceting of
cubic phases. I was the first author to observe and interpret 3D faceting in
lyotropic cubic giant monocrystals. I am currently working on
reinforced elastomers, which are nanocomposites made of solid particles
embedded in an elastomer matrix. I specifically aim at relating microscopic
properties to macroscopic mechanical behavior. This includes: - NMR measurements
of the local constraints stored in the system as a function of the strain and
of the fraction and aggregation state of solid reinforcing particles; - NMR measurements
of the polymer dynamics at or close to polymer/particle interfaces; - characterization
of the non linear and/or irreversible phenomena which occur in such systems,
such as the Payne and Mullins effects and the plasticity (residual
deformation after large amplitude
strain); - characterization
of the deformations induced by mechanical stretching at various spatial
scales with Small Angle Neutrons and Xray scattering; - dissipative
molecular dynamics simulations of model disordered, reinforced elastic
systems, to relate the macroscopic plasticity and long-time relaxation to the
non-affine deformations at the scale of the reinforcing particles. My
projects are on the ultimate properties of nanostructured polymer systems,
both in the experimental and numerical sides. |
Selected publications
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Ø
P. Sotta & B. Deloche, Uniaxiality induced in a strained Poly(dimethylsiloxane)
network. Macromolecules, 23, 1999
(1990). Ø
P. Sotta, Equilibrium shape of
lyotropic cubic monocrystals. J. Phys. II France 1 (1991) 763. Ø
P. Sotta & B. Deloche, Long-time dynamics in
poly(dimethylsiloxane) networks studied by deuterium nuclear magnetic
resonance. J. Chem. Phys. 100 (1994) 4591. Ø
P. Sotta, Local orientational order in stretched poly(dimethlysiloxane)
networks. in ‘Trends in
Macromolecular Research’, ed. by The Council of Scientific
Information, Trivandrum ,India (1994). Ø
P. Sotta, P.G. Higgs, M. Depner
& B. Deloche, Monte-Carlo
Simulations of the Orientational Order in a Strained Polymer Network: Effect
of Density. Macromolecules 28
(1995) 7208. pdf Ø
P. Sotta, C. Fuelber, D.E. Demco,
B. Bluemich & H.W. Spiess, Effect
of Residual Dipolar Interactions on the NMR Relaxation in Cross-linked
Elastomers. Macromolecules 29 (1996), 6222. pdf Ø
L. Sallen, P. Sotta, P. Oswald, Pre-Transitional Effects near the Hexagonal-Micellar Phase
Transition of the C12EO6/H2O Lyotropic
Mixture. J. Phys. Chem. B
101 (1997) 4875. Ø
A. Deluzet, H. Mayaffre,
P. Wzietek, P. Sotta, E. Dumont
& D. Jérome, Structural Transition in the Quasi-Two-Dimensional
Organic Superconductor k-(ET)2Cu[N(CN)2]Br Studied
by 13C MAS NMR. Advanced
Materials 10 (1998) 797. Ø
P. Sotta, Local order and induced orientation in PDMS model network, studied
by 2H NMR. Macromolecules
31 (1998) 3872.
pdf
Ø
P. Sotta, Local order and induced orientation in PDMS model network, studied
by 2H NMR. Macromolecules
31 (1998) 8417.
pdf Ø
S. Valic, P. Sotta & B. Deloche, 2H-NMR study of a deformed
PDMS rubber network below and above the crystallization temperature. Polymer 40 (1999) 989. Ø
P. Sotta, S. Valic, B. Deloche,
D. Maring, H. W. Spiess, Effect of the
diamagnetic susceptibility in NMR measurements in diblock copolymers. Acta Polymerica 50 (1999)
205. pdf Ø
O. Pelletier, P. Sotta, P. Davidson, Deuterium NMR Study of the Nematic Phase of Vanadium Pentoxide
Aqueous Suspensions. J. Phys.
Chem. 103 (1999) 5427. pdf Ø
P. Pieranski, P. Sotta, D. Rohe, M. Imperor-Clerc, Devil's staircase-type facetting of a
cubic lyotropic liquid crystal. Phys.
Rev. Lett. 84 (2000) 2409. pdf Ø
M. Imperor-Clerc, P. Sotta, M. Veber, Crystal shapes of cubic mesophases in pure and mixed carboxylic
acids observed by optical microscopy. Liq. Cryst. 27 (2000) 1001. Ø
P. Sotta, A. Lesne, J. M. Victor, Monte Carlo simulation of a grafted
polymer chain confined in a pore. J. Chem. Phys. 112 (2000)
1565. pdf Ø
P. Sotta, A. Lesne, J. M. Victor, The coil-globule transition for a polymer
confined in a pore. J. Chem. Phys. 113 (2000)
6966. pdf Ø
D. Constantin, P. Oswald,
M. Imperor, P. Davidson, P. Sotta, Connectivity of the Hexagonal, Cubic and
Isotropic Phases of the C12EO6/H2O Lyotropic
Mixture Investigated by Tracer Diffusion and X-ray Scattering. J. Phys. Chem. B. 105 (2001)
668. pdf Ø
P. Pieranski, L. Sittler,
P. Sotta, M. Imperor, Growth and shapes of a cubic lyotropic
liquid crystal. EPJ E 5 (2001) 317. pdf Ø
B. Deloche, P. Sotta,
Deuterium NMR in Rubbery Materials. in 'Spectroscopy of Rubbers and
Rubbery Materials', ed. by V.M. Litvinov and P.P. De, Rapra Technology ltd,
UK (2002). Ø
J. Berriot, F. Lequeux,
L. Monnerie, H. Montès, D. Long, P. Sotta, Filler-Elastomer Interaction in Model
Filled Rubbers, a 1H NMR Study. J.
Non-Cryst. Solids 307 (2002) 719. pdf Ø
J. Berriot, H. Montès, F.
Lequeux, D. Long, P. Sotta, Evidence for the shift of the glass
transition near the particles in model silica-filled elastomers. Macromolecules 35 (2002) 9756. pdf Ø
J. Berriot, F. Martin, H.
Montès, L. Monnerie, P. Sotta, Reinforcement of model filled elastomers:
Characterization of the cross-link density at the filler-elastomer interface
by 1H NMR measurements. Polymer 44
(2003) 1437. pdf Ø
J. Berriot, H. Montès, F.
Lequeux, D. Long, P. Sotta, L.
Monnerie, A Mechanism for the
Reinforcement of Filled Elastomers. Europhys. Lett. 64
(2003) 50. pdf Ø
P. Sotta, D. Long, The
crossover from 2D to 3D percolation. Theory and numerical simulations EPJ E 11 (2003) 375. pdf Ø
S. Merabia, P. Sotta, D. Long, Heterogeneous nature of the dynamics and glass transition in thin
polymer films, EPJ E 15 (2004) 189. pdf Ø
D.
Long, P. Sotta, Numerical Simulation for the mesoscale deformation of
disordered reinforced elastomers, to appear, IMA Volume Series. pdf |
Teaching activities
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Though a CNRS member, I
have been concerned by education and have given courses at the master level: - the basics of
polymer physics (material available here ) - fundamentals in liquid state and solid state
Nuclear Magnetic Resonance (material available here ) |