ED Sciences Chimiques
Organocatalyzed group transfer polymerization of dialkyl muconates: toward new polymers combining bio-based origin, post-polymerization modifications, and chemical degradability
by Thomas DARDE (Laboratoire de Chimie des Polymères Organiques)
The defense will take place at 9h00 - Amphithéâtre 1 LCPO, ENSMAC 16, Av. Pey Berland, 33600 Pessac
in front of the jury composed of
- Daniel TATON - Professeur des universités - Université de Bordeaux - Directeur de these
- Jean RAYNAUD - Chargé de recherche - Catalyse, Polymérisation, Procédés et Matériaux (CP2M) - ECOLE SUPERIEURE DE CHIMIE PHYSIQUE ELECTRONIQUE DE LYON -CPE - Rapporteur
- Fanny BONNET - Directrice de recherche - Unité Matériaux et Transformations CNRS UMR 8207 - Université de Lille - Rapporteur
- Mathias DESTARAC - Professeur des universités - Université Toulouse 3 Paul Sabatier - Examinateur
- Sébastien LECOMMANDOUX - Professeur des universités - Laboratoire de chimie des polymères organique (LCPO) - UMR 5629 - Examinateur
- Xavier SCHULTZE - Docteur - L'Oréal - Examinateur
The development of sustainable polymers is a major challenge in macromolecular chemistry. This thesis explores the potential of dialkyl muconates, derived from potentially bio-based muconic acid, as a new monomer platform for the design of polymers with properties comparable to those of polyacrylates. A controlled polymerization strategy based on organocatalyzed group transfer polymerization (O-GTP) was developed. The use of phosphazene bases in combination with a silylated initiator enables the synthesis of well-defined polymuconates with molar masses close to theoretical values and low dispersities (Đ < 1.2). The method was extended to the synthesis of both block and statistical copolymers, allowing the tuning of thermal properties and access to structured materials. The presence of double bonds also enabled post-polymerization modifications and the formation of polymer networks. Finally, degradation and chemical recycling strategies were demonstrated. These results highlight the potential of polymuconates as versatile and sustainable polymers, accessible through a controlled polymerization method that does not require metal catalysts.
ED Sciences Physiques et de l'Ingénieur
High Q Reference Oscillator for High Performance Radar Waveform Generator
by Estevan TU (Laboratoire de l'Intégration du Matériau au Système)
The defense will take place at 10h00 - Amphithéâtre J.P Dom UMR 5218 - IMS - Laboratoire de l'Intégration du Matériau au Système 351 Cours de la Libération, 33405 Talence Cedex, France
in front of the jury composed of
- Jean-Baptiste BEGUERET - Professeur des universités - Université de Bordeaux - Directeur de these
- Emmanuel PISTONO - Maître de conférences - Université Grenoble-Alpes - CoDirecteur de these
- Thierry TARIS - Professeur des universités - Université de Bordeaux - Examinateur
- Thomas BEAUCHENE - Ingénieur - NXP SEMICONDUCTORS - Examinateur
- Domenico ZITO - Full professor - AGH University of Science and Technology - Rapporteur
- Hervé BARTHELEMY - Professeur des universités - Université de Toulon - Rapporteur
This thesis addresses the design and optimization of Bulk Acoustic Wave (BAW)-based oscillators in 28 nm CMOS technology for high-performance next-generation FMCW radar systems. The work begins by analyzing the technical challenges in achieving low phase noise and high power efficiency, followed by a review of BAW resonator technology and its integration into RF circuits. In addition, a detailed analysis of RF CMOS transistors is presented, including device operation and noise mechanisms. Oscillator theory is revisited with advanced phase noise modeling approaches, including Leeson's effect, Impulse Sensitivity Function (ISF), and Perturbation Projection Vector (PPV), forming the foundation for the proposed design methodology. Two oscillator architectures are explored : cross-coupled and Colpitts topologies, implemented with NMOS and PMOS configurations. The design methodology leverages gm/ID-based transistor sizing and biasing strategies to minimize phase noise while maintaining low power consumption. Post-layout simulations and measurements validate the proposed approach. The fabricated Colpitts oscillators achieve oscillation frequencies around 2.41 GHz with core power consumption below 2 mW. Measured phase noise for the PMOS Colpitts oscillator reaches -133.8 dBc/Hz at 100 kHz offset and -159.4 dBc/Hz at 1 MHz offset, corresponding to figures of merit (FoM) of 220.1 dB and 224.5 dB, respectively. It achieves the lowest phase noise and highest FoM among all designs presented in this work, and delivers the best performance at 1 MHz offset compared to the state-of-the-art. These results confirm the suitability of the proposed designs for ulta-low phase noise and low power applications. Future work includes temperature compensation techniques and advanced packaging solutions to further enhance stability and integration in next-generation systems.