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Theses

Renforcement des polymères semi-cristallins

Abstract : The impact resistance of semi-crystalline polymers is greatly improved by dispersing (sub)micronic particles that cavitate and induce the extensive plastic deformation of the matrix rather than its brittle failure. We were concerned with several aspects of this phenomenon through the study of toughened polyamide systems. We show that nanostructured particles of block copolymers yield remarkable toughening without the loss in rigidity that is obtained with rubber particles. Furthermore, the structure of these block copolymers seems to govern the breakup and coalescence of particles during blending. More generally, microscopic observations and various thermomechanical treatments show that the crystalline organization of the matrix is determinant for toughening. Based on these results, we propose a model for toughening which considers the physical approaches to fracture in heterogeneous media and explains the physical origin of a critical matrix confinement necessary to obtain a ductile behavior. The proposed theory predicts how this characteristic length depends on crystalline organization, particle size and temperature for the studied polyamide-12 systems as well as for other systems studied in the literature
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https://pastel.archives-ouvertes.fr/tel-00012108
Contributor : Marie-France Boucher <>
Submitted on : Monday, April 10, 2006 - 5:20:38 PM
Last modification on : Saturday, September 26, 2020 - 11:44:06 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:12:08 PM

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  • HAL Id : tel-00012108, version 1

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Laurent Corté. Renforcement des polymères semi-cristallins. Physique [physics]. ESPCI ParisTECH, 2006. Français. ⟨tel-00012108⟩

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