Skip to Main content Skip to Navigation
Theses

Élaboration de particules de latex composites à base d'oxyde de cérium par polymérisation radicalaire en milieu aqueux dispersé

Abstract : This work describes the elaboration of nanocomposite latexes containing cerium dioxide nanoparticles for coating applications. Two original approaches have been developed to control the particle morphology. First, we took advantage of the high charge density of cerium dioxide nanoparticles to stabilize latex particles obtained via emulsion or “Pickering” miniemulsion polymerization. In both cases the reaction was conducted in the presence of the inorganic particles and methacrylic acid as a complexing agent, in the absence of any added surfactant. Armored latex particles covered with cerium dioxide nanoparticules were obtained by this method. Subsequently, another approach based on the use of living hydrophilic polymer chains (macroRAFT agents) previously adsorbed on the surface of the cerium dioxide nanoparticles was considered. These copolymers both containing carboxylic acid groups and carrying a thiocarbonylthio end group led to stable aqueous dispersion of the nanoparticles and could chain extend to form an encapsulating polymer shell under starved feed emulsion polymerization conditions. An optimization using a batch process was also evaluated. For both approaches, particular attention was paid to the colloidal stability of the medium and to the kinetics of the reaction. The morphology of the nanocomposite latex particles was characterized by TEM and cryo-TEM and correlated with the surface modification and the experimental conditions
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00862401
Contributor : Abes Star :  Contact
Submitted on : Monday, September 16, 2013 - 3:42:12 PM
Last modification on : Wednesday, November 20, 2019 - 3:08:44 AM
Long-term archiving on: : Friday, December 20, 2013 - 1:46:48 PM

File

TH2011_Zgheib_Nancy.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00862401, version 1

Collections

Citation

Nancy Zgheib. Élaboration de particules de latex composites à base d'oxyde de cérium par polymérisation radicalaire en milieu aqueux dispersé. Alimentation et Nutrition. Université Claude Bernard - Lyon I, 2011. Français. ⟨NNT : 2011LYO10218⟩. ⟨tel-00862401⟩

Share

Metrics

Record views

664

Files downloads

3862