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Contribution of atomic force microscopy to local mechanical characterization of polymer materials

Abstract : This thesis work aims to show how nanomechanical characterizations in AFM can provide a better understanding of structure-properties relationships in polymers. In this context, the technique itself and the associated theoretical basis are first analyzed to implement a robust methodology in order to perform reproducible, quantitative measurements. Two main studies are carried out around a common topic: the understanding of the interactions between biopolymers and ionic liquids (ILs). First, the compatibilization of PBAT/PLA blends by two different ILs (namely il-Cl and il-TMP) is studied. Adhesion and local modulus mappings evidence the resulting microstructures, and highlight that the compatibilization mainly results from a modification of the PBAT/PLA interface, becoming a coherent interphase. This is due to specific interaction with the cations and the anions of each IL, which are preferentially located at those interphases. The second study is more specifically about the understanding of the modification of semicrystalline PBAT by the addition of small amounts of the same ionic liquids. While il-TMP forms dissipative nodules dispersed into the matrix with a cohesive interphase between both, il-Cl, miscible into the amorphous phase of PBAT, amplifies the chain mobility in the bulky MAF (i.e. Mobile Amorphous Fraction) and hinders it in the confined RAF (i.e. Rigid Amorphous Fraction), leading to interesting macroscopical properties modifications. More than showing some interesting capabilities of ILs as additives in polymers, those results also show an outstanding potential of AFM nanomechanical mappings for the in-deep understanding of structure-properties relationships in materials.
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Submitted on : Friday, February 1, 2019 - 12:59:05 PM
Last modification on : Wednesday, September 16, 2020 - 4:09:22 AM
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  • HAL Id : tel-02000347, version 1


Benjamin Megevand. Contribution of atomic force microscopy to local mechanical characterization of polymer materials. Materials. Université de Lyon, 2018. English. ⟨NNT : 2018LYSEI023⟩. ⟨tel-02000347⟩



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