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Relations structure/propriétés thermomécaniques élongationelles de films polymères thermoplastiques

Abstract : The work presented in this manuscript is devoted to the modeling of the thermomechanicalbehavior of polymer films deformed at the rubbery state. The modeling of the isotropicamorphous films is realized using the Lodge and the MSF models. For deformations appliednear the glass transition temperature, the predictions of these models are improved byincluding relaxation times coming from the glass transition domain in the spectra. Forpre-oriented amorphous films, the anisotropy is modeled by considering that it is due to aprevious equivalent deformation during the fabrication process.The relationship between the crystalline phase and the mechanical behavior at roomtemperature for the semi-crystalline films is established. During the deformation at therubbery sate of the semi-crystalline films, a reorientation of the crystalline phase occurs alongthe stretching direction. Based on the experimental observations, a semi-empirical model isdeveloped in order to describe the mechanical behavior of the semi-crystalline films. In thismodel, the contributions of both phases, amorphous and crystalline are separated. Thereorientation of the crystalline phase leads to a strain hardening stage which could bepredicted by the model
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  • HAL Id : tel-00871322, version 1


Anthony Thevenon. Relations structure/propriétés thermomécaniques élongationelles de films polymères thermoplastiques. Autre. Université Claude Bernard - Lyon I, 2012. Français. ⟨NNT : 2012LYO10020⟩. ⟨tel-00871322⟩



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