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December 12, 2016

Thesis defense of Davide COLOMBO

Thesis defense of Davide COLOMBO

Davide COLOMBO will defend his thesis untitled

Modeling the macroscopic mechanical behavior of filled elastomers from local polymer dynamics

 the defense will take place on: 

Monday 12th December 2016 at 14:30
 
at amphi Schutzenberger (ESPCI, 10 rue Vauquelin, 75005 Paris)
The defense will not be public
contact : sabine.cantournet@mines-paristech.fr
 
Abstract : The addition of active filler (silica, carbon black) in rubbers leads to unusual mechanical behaviors, whose modeling represents still a challenging task. In these materials, the reinforcement is given by a network of filler aggregates connected by confined polymer regions (the size of few nanometers), where the polymer is in its glassy state because of the filler-matrix interaction. In our work, we propose a continuum mechanics approach to reproduce the physics of reinforcement from the nanoscopic to the macroscopic level. Firstly, we perform an experimental investigation of silica filled PDMS rubbers. Secondly, we derive a constitutive equation for the behaviour of glassy polymer within confined regions. Then, we study the effect of a confinement region on the force transmission between a pair of aggregates. We deduce that the contribution of the confined polymer is well separated from the rubbery geometric contribution. Finally, we build a network representation for a distribution of confinement states within the polymer nanocomposite. As a result, the model reproduces complex modulus temperature dependence and strain amplitude non-linearity (Payne effect).
thesis defense D COLOMBO - MINES ParisTech

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