Plastic properties of glassy polymers: a microscopic theory

PhD starting as soon as possible in 2017 (Cifre funding)

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Understanding the mechanical and dynamical properties of polymers close to the glass transition is of utmost importance in order e.g. to realize polymer materials with the desired physical properties. The physical origin of these properties are only now being unravelled and are related directly to glass transition mechanisms, in the bulk and at interfaces [1,2]. We have developed recently a model (theory and numerical simulations tool) for describing the mechanical and dynamical properties of polymers close to and below Tg, in the bulk or in the vicinity of interfaces, from the linear up to the non-linear properties [3,4], up to the so-called strain hardening of glassy polymers, for which we have proposed a microscopic description [4]. The aim is to study in more detail the connection between microscopic specificities of the considered polymer (rigidity of the backbone, pendant groups, chemical details,...) and the ultimate properties of the polymer. This theoretical approach is developed in conjunction with experimental works in our lab and in collaboration with other groups in Lyon. Our approaches are those of statistical physics and polymer physics.

[1] Long, D. and Lequeux F. EPJ E (2001) 4, 371

[2] Dequidt A., Long D.R., Sotta P. and Sanséau O., European Physical Journal E (2012) 

[3] Dequidt et al, Macromolecules (2016) 

[4] Luca Conca, PhD thesis, Lyon 2016

Please send application (detailed CV, application letter) to

Didier LONG

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Tel : +33 428 27 10 30