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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation |
Document Type: | Computer File |
All Authors / Contributors: |
Mathieu Fuentes-Exposito; Muriel Lansalot; Franck D'Agosto; Emmanuel Beyou; Christelle Delaite, chercheuse en chimie).; Jutta Rieger; Salima Boutti; Université de Lyon (2015-....).; École Doctorale de Chimie (Lyon).; Université Claude Bernard (Lyon).; Laboratoire de Chimie, Catalyse, Polymères et Procédés. |
OCLC Number: | 1137420060 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Mathieu Fuentes-Exposito ; sous la direction de Muriel Lansalot et de Franck D'Agosto. |
Abstract:
This work describes the synthesis of self-stabilized PVDF particles by combining the advantages of emulsion polymerization with those of controlled radical polymerization (CRP) using the RAFT process. First, a commercial methoxy poly(ethylene glycol) carrying a hydroxyl function (PEG-OH) was used for the stabilization of PVDF particles. The stabilization is provided by irreversible transfer reactions occurring along the PEG-OH chains leading to the formation of a grafted copolymer stabilizer in situ. This PEG-OH was then chain-end functionalized to introduce a xanthate group (macroRAFT, PEG-X). The experiments carried out in the presence of this macroRAFT demonstrated a strong implication of the xanthate chain-end in the VDF emulsion polymerization process. Indeed, particle sizes of 200 nm and 70 nm were obtained in the presence of PEG-OH and PEG-X, respectively. This trend was confirmed during the study of the impact of various parameters such as the molar mass of the PEG chain or the initiator amount. Additional analyses (surface tension measurement and differential scanning calorimetry) allowed to compare the anchoring efficiency of PEG-X and PEG-OH. The macroRAFT amount was then increased to form particles composed of block copolymer. In-depth NMR analyses were then conducted to identify the species created during the VDF emulsion polymerization process in the presence of PEG-OH and PEG-X. In comparison, PEGs carrying reactive functions such as (meth)acrylate and thiol were used as stabilizers and their efficiencies compared to those of PEG-OH and PEG-X. The macroRAFT architecture was also varied using a difunctional macroRAFT (X-PEG-X) and a grafted polymer (PPEGA-X). Finally, PVDF latexes were synthesized with poly((meth)acrylic acid) (P(M)AA) functionalized by either a trithiocarbonate or a xanthate. Like previously, several parameters were varied such as the macromolecular chain length, the initiator amount and the macroRAFT amount. Again, these studies demonstrated the strong impact of the RAFT chain-end in the stabilization of PVDF particles.
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Related Subjects:(8)
- Fluorure de polyvinylidène.
- Polymérisation en émulsion.
- Polyéthylèneglycol.
- Fluorure de vinylidène (VDF)
- Poly(éthylène glycol) (PEG)
- Poly(acide (méth)acrylique) (P(M)AA)
- Polymérisation radicalaire contrôlée (PRC)
- Transfert de chaîne réversible par addition-fragmentation (RAFT)